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A012354
Expansion of e.g.f. tan(tan(x) * log(x+1)).
0
0, 0, 2, -3, 16, -50, 560, -4116, 49376, -495648, 6643648, -86408080, 1355660480, -21635261856, 389870008320, -7287717739680, 148738206314496, -3175392718618112, 72630134425104384, -1740244201350372864, 44148745987324567552, -1171621057231560284160
OFFSET
0,3
EXAMPLE
2/2!*x^2 - 3/3!*x^3 + 16/4!*x^4 - 50/5!*x^5 ...
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Tan[Tan[x]Log[x+1]], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Nov 04 2019 *)
CROSSREFS
Sequence in context: A012353 A012703 A012699 * A012358 A012700 A012705
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
EXTENSIONS
a(0) and a(1) inserted and title improved by Sean A. Irvine, Jul 18 2018
STATUS
approved