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A012775 E.g.f.: arctan(sec(x)*log(x+1)) = x - 1/2!*x^2 + 3/3!*x^3 - 37/5!*x^5 + 345/6!*x^6 - …. 0
0, 1, -1, 3, 0, -37, 345, -1967, 2296, 122093, -2157165, 21241847, -62837544, -2704412921, 74329911565, -1080320786971, 5480675823120, 220652162236409, -8577532338045273, 168598543971458059, -1306206271210775920, -46736993299592412013 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..21.

MATHEMATICA

With[{nn=20}, CoefficientList[Series[ArcTan[Sec[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 10 2013 *)

CROSSREFS

Sequence in context: A058833 A266168 A276913 * A157308 A157310 A172396

Adjacent sequences:  A012772 A012773 A012774 * A012776 A012777 A012778

KEYWORD

sign

AUTHOR

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

EXTENSIONS

a(0) prepended and definition clarified by Harvey P. Dale, Dec 10 2013

STATUS

approved

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Last modified May 19 17:48 EDT 2019. Contains 323395 sequences. (Running on oeis4.)