A012073 sec(arcsin(arcsin(x)))=1+1/2!*x^2+13/4!*x^4+469/6!*x^6+32985/8!*x^8...

1, 1, 13, 469, 32985, 3818601, 658371429, 158197312701, 50529852678321, 20707179214389201, 10591085815045781949, 6613325759240221954725, 4951199941339632477906825, 4377912560491798717856660025

Offset

0,3

Links

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

Crossrefs

Sequence in context: A198154 A197234 A262570 * A012143 A368788 A173403

Adjacent sequences: A012070 A012071 A012072 * A012074 A012075 A012076

Keyword

nonn

Author

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

Status

approved