A012193 -id:A012193 - cp's OEIS frontend

A128274 Absolute values of numerators of series expansion of cosh(x)/sqrt((cosh(x))^2+(sinh(x))^2) about 0 (even-indexed coefficients only).

1, 1, 17, 721, 58337, 7734241, 218014151, 419784870961, 153563504618177, 10300599833780983, 2486497854930863041, 30262124466958766778001, 3711710439292601861342231, 26350476755161831091778460321, 31166629149666821954776191205937, 45673109693364177065089340171611

Offset: 0

Artur Jasinski, Feb 22 2007

nonn

Cf. A012085, A012193, A128275.

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

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

A128275 Absolute values of numerators of series expansion of sinh(x)/sqrt((cosh(x))^2+(sinh(x))^2) about 0 (odd indexed coefficients only).

Original entry on oeis.org

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

Offset: 0

Artur Jasinski, Feb 22 2007

nonn

Cf. A012085, A012193, A128274.

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

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

cp's OEIS Frontend

A128274 Absolute values of numerators of series expansion of cosh(x)/sqrt((cosh(x))^2+(sinh(x))^2) about 0 (even-indexed coefficients only).

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