A012084 cosh(arcsin(tan(x)))=1+1/2!*x^2+13/4!*x^4+421/6!*x^6+26713/8!*x^8...

1, 1, 13, 421, 26713, 2871241, 473357413, 111506036461, 35624155784113, 14838126699784081, 7813931867856058813, 5076900281143623362101, 3989607021222775392853513, 3730016905780866035656178521

Offset

0,3

Links

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

Crossrefs

Sequence in context: A100872 A012045 A012109 * A114759 A260871 A260851

Adjacent sequences: A012081 A012082 A012083 * A012085 A012086 A012087

Keyword

nonn

Author

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

Status

approved