OFFSET
0,2
COMMENTS
LINKS
Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).
FORMULA
a(n) = (n^3 + 6*n^2 + 17*n + 6)/6.
a(n) = A004006(n+2) - 2, n > 0.
PROG
(PARI) a(n) = (n^3 + 6*n^2 + 17*n + 6)/6;
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Torlach Rush, Feb 06 2021
STATUS
approved