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A203775 Square root of v(2*n+1) / (2*v(2*n)), where v=A203773. 2
1, 20, 1170, 136000, 26276900, 7605187200, 3079172005000, 1661435709440000, 1152219238256970000, 998612074565747200000, 1057635292751424744500000, 1344007509419503558656000000, 2018255243962112126438545000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A203773.

LINKS

Table of n, a(n) for n=1..13.

FORMULA

a(n) = n*gamma((1-i)*n)*gamma((1+i)*n)*sinh(n*Pi)/Pi (conjecture). - Velin Yanev, Nov 14 2016

MATHEMATICA

(See A203773.)

CROSSREFS

Sequence in context: A265654 A152130 A151625 * A184269 A042745 A158912

Adjacent sequences:  A203772 A203773 A203774 * A203776 A203777 A203778

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 05 2012

STATUS

approved

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Last modified July 15 16:29 EDT 2019. Contains 325049 sequences. (Running on oeis4.)