OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..50
EXAMPLE
1 - 12/4!*x^4 + 3472/8!*x^8 - 20044992/12!*x^12 ...
PROG
(PARI) a(n)={my(x=x+O(x*x^(4*n))); polcoef(serlaplace(1/cosh(asinh(x)*asin(x))), 4*n)} \\ Andrew Howroyd, Nov 05 2019
CROSSREFS
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
Terms a(8) and beyond from Andrew Howroyd, Nov 05 2019
STATUS
approved