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 A211610 Sum_{k=1..n-1} binomial (2*k, k)^n. 2
 4, 224, 161312, 1683907808, 256213978094784, 575112148876911852416, 19248204431728945392010740480, 9687459136669902998216039379883774976, 73815961078227084527800998811241905249902260224, 8562177846610881578580018959490439733543225146878872883200 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS 2^n divides a(n). p divides a(p) for prime p of the form p = 6k + 1. LINKS FORMULA a(n) = Sum[ Binomial[2 k, k]^n, {k, 1, n - 1}]. a(n) ~ exp(3/8) * 4^(n^2-n) / (Pi^(n/2) * n^(n/2)). - Vaclav Kotesovec, Mar 03 2014 MATHEMATICA Table[ Sum[ Binomial[2 k, k]^n, {k, 1, n - 1}], {n, 2, 13}] CROSSREFS Cf. A211611, A238717. Sequence in context: A259460 A227822 A052209 * A042539 A182484 A159281 Adjacent sequences:  A211607 A211608 A211609 * A211611 A211612 A211613 KEYWORD nonn AUTHOR Alexander Adamchuk, Apr 17 2012 STATUS approved

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Last modified October 22 11:23 EDT 2018. Contains 316438 sequences. (Running on oeis4.)