OFFSET
0,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..300
FORMULA
From G. C. Greubel, Mar 03 2021: (Start)
a(n) = 2*A051606(n).
G.f.: 2*Hypergeometric2F0([1, 3]; --; 3*x).
E.g.f.: 2/(1-3*x)^3. (End)
D-finite with recurrence a(n) +3*(-n-2)*a(n-1)=0. - R. J. Mathar, Aug 20 2021
MAPLE
MATHEMATICA
Table[3^n*(n + 2)!, {n, 0, 30}]
PROG
(Magma) [3^n*Factorial(n + 2): n in [0..20]]; // Vincenzo Librandi, Aug 24 2016
(Sage) [3^n*factorial(n+2) for n in (0..20)] # G. C. Greubel, Mar 03 2021
(PARI) a(n) = 3^n*(n + 2)!; \\ Michel Marcus, Mar 03 2021
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Roger L. Bagula and Gary W. Adamson, Dec 30 2008
STATUS
approved