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A166231
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a(n) = 2^C(n+1,2)*A006012(n).
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4
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1, 4, 48, 1280, 69632, 7602176, 1660944384, 725849473024, 634418209226752, 1109011408239984640, 3877275019992826380288, 27111105978154633171828736, 379138479844261543254652092416, 10604214183559196000870296488771584
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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a(n) = 2^C(n+1,2)*Sum_{k=0..floor(n/2)} C(n,2k)*2^(n-k).
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MATHEMATICA
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Table[2^(Binomial[n + 1, 2])*Sum[Binomial[n, 2 k]*2^(n - k), {k, 0, Floor[n/2]}], {n, 0, 25}] (* G. C. Greubel, May 07 2016 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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