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A013113 sec(arcsinh(x)+arctan(x))=1+4/2!*x^2+56/4!*x^4+1990/6!*x^6... 0
1, 4, 56, 1990, 130280, 13814650, 2137954100, 457685029750, 128915903246000, 46370152422675250, 20689120752785127500, 11232151174947132868750, 7281395066161326989645000, 5560840304175437693730906250 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 7 02:40 EST 2023. Contains 360111 sequences. (Running on oeis4.)