A013006 cosh(arctan(x)+tan(x))=1+4/2!*x^2+16/4!*x^4+544/6!*x^6+11008/8!*x^8...

1, 4, 16, 544, 11008, 1060224, 38065152, 9708670976, 276991311872, 283899182678016, -9456062364418048, 21467065808907534336, -3522630891818080796672, 3483761539375407422242816

Offset

0,2

Links

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

Crossrefs

Sequence in context: A037976 A013138 A262546 * A013001 A218644 A013179

Adjacent sequences: A013003 A013004 A013005 * A013007 A013008 A013009

Keyword

sign

Author

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

Status

approved