OFFSET
1,2
COMMENTS
See the reference for an explanation of the rather cryptic definition.
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..1000
C. Krishnamachari, The operator (xD)^n, J. Indian Math. Soc., 15 (1923),3-4. [Annotated scanned copy]
FORMULA
From Alois P. Heinz, Jul 04 2015: (Start)
G.f.: (24*x^3+58*x^2+22*x+1)*x/(x-1)^8.
a(n) = n^3*(n+3)*(n+2)*(n+1)^2/48.
a(n) = n*Stirling2(n+3,n). (End)
MAPLE
a:= n-> n^3*(n+3)*(n+2)*(n+1)^2/48:
seq(a(n), n=1..40); # Alois P. Heinz, Jul 04 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jun 30 2015
EXTENSIONS
More terms from Alois P. Heinz, Jul 04 2015
STATUS
approved