OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (13,-60,112,-64).
FORMULA
a(n) = ((9*n^2+21*n+14) * 4^(n+1) - 2)/54.
PROG
(PARI) a(n) = ((9*n^2+21*n+14)*4^(n+1)-2)/54;
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Seiichi Manyama, Nov 24 2023
STATUS
approved