OFFSET
0,4
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
FORMULA
E.g.f.: (exp(-x^2)+1)/(1-x)/2. - Vladeta Jovovic, Nov 09 2003
a(n) ~ n! * (1+exp(-1))/2. - Vaclav Kotesovec, Oct 08 2013
MATHEMATICA
mx = 21; Rest[ Range[0, mx]! CoefficientList[ Series[(Exp[-x^2] + 1)/(1 - x)/2, {x, 0, mx}], x]] (* Robert G. Wilson v, May 04 2013 *)
PROG
(PARI) x='x+O('x^50); Vec(serlaplace((exp(-x^2)+1)/(1-x)/2)) \\ G. C. Greubel, Aug 20 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Yuval Dekel (dekelyuval(AT)hotmail.com), Nov 07 2003
EXTENSIONS
More terms from Robert G. Wilson v, May 04 2013
a(0) = 1 prepended by Alois P. Heinz, Jun 14 2015
STATUS
approved