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Absolute values of numerators of series expansion of sinh(x)/sqrt((cosh(x))^2+(sinh(x))^2) about 0 (odd indexed coefficients only).
0

%I #6 Apr 08 2021 12:15:19

%S 1,5,121,1369,698161,22394737,25947503401,29819441791,

%T 3389281372287841,354891998735343073,1147649139272698443481,

%U 179707467079684030326841,76137452589606191547280211,183280927961986287722231696209,1163176750283121903011836076436361

%N Absolute values of numerators of series expansion of sinh(x)/sqrt((cosh(x))^2+(sinh(x))^2) about 0 (odd indexed coefficients only).

%t Series[Sinh[x]/(Sqrt[Cosh[x]^2 + Sinh[x]^2]), {x, 0, 20}]

%Y Cf. A012085, A012193, A128274.

%K nonn

%O 0,2

%A _Artur Jasinski_, Feb 22 2007

%E Offset 0 and more terms from _Alois P. Heinz_, Apr 08 2021