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A066300
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Number of n X n matrices with exactly 2 1's in each row, other entries 0.
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2
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0, 1, 27, 1296, 100000, 11390625, 1801088541, 377801998336, 101559956668416, 34050628916015625, 13931233916552734375, 6831675453247426400256, 3955759092264800909058048, 2670419511272061205254504361
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OFFSET
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1,3
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LINKS
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FORMULA
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a(n) = binomial(n,2)^n.
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MATHEMATICA
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Table[ Binomial[n, 2]^n, {n, 1, 16} ]
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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Sharon Sela (sharonsela(AT)hotmail.com), Jan 01 2002
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EXTENSIONS
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STATUS
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approved
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