OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..5000
Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).
FORMULA
a(n) = n*(n+1)*(n+2)*(3*n+7)*(9*n^2+33*n+22)/48.
G.f.: -x*(80+246*x+78*x^2+x^3) / (x-1)^7 . - R. J. Mathar, Oct 08 2011
MATHEMATICA
Table[n (n + 1) (n + 2) (3 n + 7) (9 n^2 + 33 n + 22) / 48, {n, 1, 50}] (* Vincenzo Librandi, Jul 07 2019 *)
PROG
(Magma) [n*(n+1)*(n+2)*(3*n+7)*(9*n^2+33*n+22)/48: n in [1..40]]; // Vincenzo Librandi, Jul 07 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved