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A057065
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a(n) = floor(n^n/2).
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5
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0, 0, 2, 13, 128, 1562, 23328, 411771, 8388608, 193710244, 5000000000, 142655835305, 4458050224128, 151437553296126, 5556003412779008, 218946945190429687, 9223372036854775808, 413620130943168382088, 19673204037648268787712, 989209827830156794561989
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listen;
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OFFSET
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0,3
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LINKS
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FORMULA
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EXAMPLE
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a(5) = floor(5^5/2) = floor(3125/2) = 1562.
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MATHEMATICA
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Join[{0}, Table[Floor[n^n/2], {n, 20}]] (* Harvey P. Dale, May 19 2012 *)
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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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EXTENSIONS
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STATUS
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approved
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