A203775 Square root of v(2*n+1) / (2*v(2*n)), where v=A203773.

1, 20, 1170, 136000, 26276900, 7605187200, 3079172005000, 1661435709440000, 1152219238256970000, 998612074565747200000, 1057635292751424744500000, 1344007509419503558656000000, 2018255243962112126438545000000

Offset: 1

Author

Clark Kimberling, Jan 05 2012

Keywords

• nonn

Comments

See A203773.

Programs

Mathematica

(See A203773.)

Formula

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