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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).
0
1, 5, 121, 1369, 698161, 22394737, 25947503401, 29819441791, 3389281372287841, 354891998735343073, 1147649139272698443481, 179707467079684030326841, 76137452589606191547280211, 183280927961986287722231696209, 1163176750283121903011836076436361
OFFSET
0,2
MATHEMATICA
Series[Sinh[x]/(Sqrt[Cosh[x]^2 + Sinh[x]^2]), {x, 0, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Feb 22 2007
EXTENSIONS
Offset 0 and more terms from Alois P. Heinz, Apr 08 2021
STATUS
approved