OFFSET
0,4
PROG
(PARI) my(N=40, x='x+O('x^N)); v=Vec(serlaplace(tan(cos(x)-1))); concat(0, vector(#v\2, k, v[2*k-1]))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Mar 23 2022
STATUS
approved