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A013006 cosh(arctan(x)+tan(x))=1+4/2!*x^2+16/4!*x^4+544/6!*x^6+11008/8!*x^8... 0
1, 4, 16, 544, 11008, 1060224, 38065152, 9708670976, 276991311872, 283899182678016, -9456062364418048, 21467065808907534336, -3522630891818080796672, 3483761539375407422242816 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 29 08:46 EDT 2021. Contains 346340 sequences. (Running on oeis4.)