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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
OFFSET
0,2
CROSSREFS
Sequence in context: A322733 A012983 A012959 * A009105 A168481 A171801
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved