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A012407 sech(arctan(x)*log(x+1)) = 1 - 12/4!*x^4 + 60/5!*x^5 - 90/6!*x^6 + 420/7!*x^7... 1
1, 0, 0, 0, -12, 60, -90, 420, -4928, -32256, 788760, -4052400, 12074568, -397549152, 2860681824, 80960836320, -1570434928128, 8575093540224, -83967092441280, 3671889608928384, -27749577690072192 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

MATHEMATICA

Range[0, 20]! CoefficientList[ Series[ Sech[ArcTan[x] Log[x + 1]], {x, 0, 20}], x] (* Robert G. Wilson v, Nov 13 2011 *)

CROSSREFS

Sequence in context: A097302 A075367 A012658 * A009093 A012400 A009172

Adjacent sequences:  A012404 A012405 A012406 * A012408 A012409 A012410

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified September 20 05:04 EDT 2021. Contains 347577 sequences. (Running on oeis4.)