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A235532
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a(n) = floor(n^2 * (4-Pi)).
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0
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0, 0, 3, 7, 13, 21, 30, 42, 54, 69, 85, 103, 123, 145, 168, 193, 219, 248, 278, 309, 343, 378, 415, 454, 494, 536, 580, 625, 672, 721, 772, 824, 879, 934, 992, 1051, 1112, 1175, 1239, 1305, 1373, 1442, 1514, 1587, 1661, 1738, 1816, 1896, 1977, 2061, 2146, 2232, 2321
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refs;
listen;
history;
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internal format)
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OFFSET
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0,3
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COMMENTS
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a(n) = floor(As(n) - Ac(n)), where Ac(n) is the area of the circle of radius n, and As(n) is the area of square with side length 2n.
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LINKS
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MATHEMATICA
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PROG
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(Python)
import math
for n in range(77): print(str(int(n*n*(4-math.pi))), end=', ')
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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