A013113 sec(arcsinh(x)+arctan(x))=1+4/2!*x^2+56/4!*x^4+1990/6!*x^6...

1, 4, 56, 1990, 130280, 13814650, 2137954100, 457685029750, 128915903246000, 46370152422675250, 20689120752785127500, 11232151174947132868750, 7281395066161326989645000, 5560840304175437693730906250

Offset

0,2

Links

Table of n, a(n) for n=0..13.

Crossrefs

Sequence in context: A322733 A012983 A012959 * A009105 A168481 A171801

Adjacent sequences: A013110 A013111 A013112 * A013114 A013115 A013116

Keyword

nonn

Author

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

Status

approved