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A013149 cosh(tanh(x)+arctan(x))=1+4/2!*x^2-16/4!*x^4+64/6!*x^6+4096/8!*x^8... 0
1, 4, -16, 64, 4096, -480896, 54717440, -7775895552, 1454255472640, -360442602684416, 116460747215831040, -47685470462142971904, 24020257118743960748032, -14514884376044102613991424 (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: A155518 A005401 A002923 * A175065 A033140 A181879

Adjacent sequences:  A013146 A013147 A013148 * A013150 A013151 A013152

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified May 6 07:01 EDT 2021. Contains 343580 sequences. (Running on oeis4.)