A013165 sec(arctanh(x)+log(x+1))=1+4/2!*x^2-6/3!*x^3+115/4!*x^4-500/5!*x^5...

1, 0, 4, -6, 115, -500, 8830, -70770, 1316825, -15886440, 324218600, -5249917750, 119185529675, -2412502361100, 61104527105050, -1476059511449250, 41607421213320625, -1162370434739930000

Offset

0,3

Links

Table of n, a(n) for n=0..17.

Crossrefs

Sequence in context: A012909 A219507 A012934 * A337466 A052672 A137025

Adjacent sequences: A013162 A013163 A013164 * A013166 A013167 A013168

Keyword

sign

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Status

approved