OFFSET
0,4
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
FORMULA
E.g.f.: exp(tan(x))/exp(x).
E.g.f.: E(0)-1, where E(k) = 2 + (tan(x)-x)/(2*k + 1 - (tan(x)-x)/E(k+1) ); (continued fraction). - Sergei N. Gladkovskii, Dec 23 2013
MATHEMATICA
Table[n!, {n, 0, 21}] * CoefficientList[Series[Exp[Tan[x]-x], {x, 0, 21}], x]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
Extended and signs tested by Olivier Gérard, Mar 15 1997
STATUS
approved