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A012997 exp(arctan(x)+tan(x))=1+2*x+4/2!*x^2+8/3!*x^3+16/4!*x^4+72/5!*x^5... 0
1, 2, 4, 8, 16, 72, 544, 3040, 11008, 64896, 1060224, 10595840, 38065152, 87854080, 9708670976, 170663275520, 276991311872, -13108265091072, 283899182678016, 9548887177330688, -9456062364418048 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Sequence in context: A076086 A074700 A013133 * A013184 A066713 A004000

Adjacent sequences:  A012994 A012995 A012996 * A012998 A012999 A013000

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified May 25 05:13 EDT 2013. Contains 225643 sequences.