A012143 cosh(arcsin(arctanh(x)))=1+1/2!*x^2+13/4!*x^4+469/6!*x^6+33433/8!*x^8...

1, 1, 13, 469, 33433, 3984681, 718210725, 183013440765, 62801454477105, 27970921286867025, 15708198897246520125, 10866653910101298549285, 9083998201236955132833225, 9030162506735790711308044665

Offset

0,3

Links

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

Crossrefs

Sequence in context: A197234 A262570 A012073 * A368788 A173403 A220560

Adjacent sequences: A012140 A012141 A012142 * A012144 A012145 A012146

Keyword

nonn

Author

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

Status

approved