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A013236 Expansion of e.g.f. tan(log(x+1) - tan(x)). 2
0, 0, -1, 0, -6, 8, -150, 448, -7560, 38432, -642600, 4827328, -83392848, 846371264, -15413462064, 198308799232, -3850826179200, 59939510237696, -1248952432920192, 22723443584373760, -509532711855338240, 10564033699974222848, -255033199091475264768 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

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

EXAMPLE

-1/2!*x^2 - 6/4!*x^4 + 8/5!*x^5 - 150/6!*x^6 ...

MATHEMATICA

Range[0, 25]! CoefficientList[Series[Tan[Log[x + 1] - Tan[x]], {x, 0, 25}], x] (* Vincenzo Librandi, Aug 02 2018 *)

PROG

(PARI) x = 'x + O('x^30); concat([0, 0], Vec(serlaplace(tan(log(x+1) - tan(x))))) \\ Michel Marcus, Aug 02 2018

CROSSREFS

Sequence in context: A013235 A257869 A201387 * A013242 A169971 A295429

Adjacent sequences: A013233 A013234 A013235 * A013237 A013238 A013239

KEYWORD

sign

AUTHOR

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

EXTENSIONS

a(0)=a(1)=0 inserted and title improved by Sean A. Irvine, Aug 01 2018

STATUS

approved

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Last modified February 3 23:01 EST 2023. Contains 360045 sequences. (Running on oeis4.)