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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
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: A359419 A372135 A012658 * A009093 A012400 A009172
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved

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Last modified May 28 18:29 EDT 2024. Contains 372919 sequences. (Running on oeis4.)