OFFSET
0,2
COMMENTS
Even 12-gonal numbers. Bisection of A051624.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (3,-3,1).
MATHEMATICA
PolygonalNumber[12, 2*Range[0, 40]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 02 2017 *)
PROG
(PARI) a(n)=4*n*(5*n-2) \\ Charles R Greathouse IV, Jun 17 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Omar E. Pol, Aug 19 2011
STATUS
approved