OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..100
EXAMPLE
x^2/2! + 116*x^6/6! + 202576*x^10/10! + 1557978176*x^14/14! ...
MATHEMATICA
Sinh[ Tanh[ x ]*Tan[ x ] ]/2 (* [ x^(4n+2) ] *)
PROG
(PARI) seq(n)={my(A=O(x^(4*n+2))); Vec(substpol(serlaplace( sinh(tanh(x + A)*tan(x + A))/2 )/x^2, x^4, x))} \\ Andrew Howroyd, Jan 12 2025
CROSSREFS
KEYWORD
nonn,changed
AUTHOR
EXTENSIONS
Extended and signs tested 03/97.
a(9) onwards from Andrew Howroyd, Jan 12 2025
STATUS
approved