A128275 - OEIS

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A128275

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

1, 5, 121, 1369, 698161, 22394737, 25947503401, 29819441791, 3389281372287841, 354891998735343073, 1147649139272698443481, 179707467079684030326841, 76137452589606191547280211, 183280927961986287722231696209, 1163176750283121903011836076436361

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

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

CROSSREFS

Cf. A012085, A012193, A128274.

Sequence in context: A172806 A054752 A258978 * A028448 A108791 A282271

Adjacent sequences: A128272 A128273 A128274 * A128276 A128277 A128278

KEYWORD

nonn

AUTHOR

Artur Jasinski, Feb 22 2007

EXTENSIONS

Offset 0 and more terms from Alois P. Heinz, Apr 08 2021

STATUS

approved