OFFSET
3,1
LINKS
Andrew Howroyd, Table of n, a(n) for n = 3..200
Eric Weisstein's World of Mathematics, Cycle Graph
Index entries for linear recurrences with constant coefficients, signature (4,2,-12,-9).
FORMULA
PROG
(PARI) a(n) = 6*n*(3^(n-2) + (-1)^n);
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Andrew Howroyd, Sep 11 2019
STATUS
approved