login
A193872
Even dodecagonal numbers: 4*n*(5*n - 2).
3
0, 12, 64, 156, 288, 460, 672, 924, 1216, 1548, 1920, 2332, 2784, 3276, 3808, 4380, 4992, 5644, 6336, 7068, 7840, 8652, 9504, 10396, 11328, 12300, 13312, 14364, 15456, 16588, 17760, 18972, 20224, 21516, 22848, 24220, 25632, 27084, 28576, 30108, 31680
OFFSET
0,2
COMMENTS
Even 12-gonal numbers. Bisection of A051624.
FORMULA
a(n) = 4*A147874(n+1).
a(n) = 4*n*A016885(n-1), n >= 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