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A036404

a(n) = ceiling(n^2/5).

0, 1, 1, 2, 4, 5, 8, 10, 13, 17, 20, 25, 29, 34, 40, 45, 52, 58, 65, 73, 80, 89, 97, 106, 116, 125, 136, 146, 157, 169, 180, 193, 205, 218, 232, 245, 260, 274, 289, 305, 320, 337, 353, 370, 388, 405, 424, 442, 461, 481, 500, 521, 541, 562, 584

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OFFSET

0,4

LINKS

Table of n, a(n) for n=0..54.

Index entries for linear recurrences with constant coefficients, signature (2,-1,0,0,1,-2,1).

FORMULA

G.f. -x*(1+x)*(x^2-x+1)^2 / ( (x^4+x^3+x^2+x+1)*(x-1)^3 ). - R. J. Mathar, Jan 22 2011

CROSSREFS

Sequence in context: A199425 A057129 A281898 * A347355 A186077 A358610

Adjacent sequences: A036401 A036402 A036403 * A036405 A036406 A036407

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved