OFFSET
0,3
FORMULA
a(n) ~ n! * exp(1/6). - Vaclav Kotesovec, Aug 04 2014
a(n) = n! * Sum_{k=0..floor(n/3)} 1/(6^k * k!). - Seiichi Manyama, Feb 27 2024
MATHEMATICA
With[{nn=20}, CoefficientList[Series[Exp[x^3/6]/(1-x), {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 10 2018 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Karol A. Penson, Jun 08 2007
EXTENSIONS
More terms from Harvey P. Dale, May 10 2018
STATUS
approved