A140958 A090801(2n-1)+A090801(2n).

3, 36, 108, 420, 684, 1008, 1332, 1668, 2076, 2772, 2952, 3168, 3576, 4236, 4776, 5148, 5532, 5892, 6312, 6696, 7008, 7776, 8064, 8640, 8964, 9648, 10044, 10368, 10692, 11376, 12600, 13872, 14460, 15072, 15288, 15732, 15984, 16344, 17280, 17712, 18132, 18876

Offset: 1

Author

Paul Curtz, Jul 26 2008

Keywords

• nonn

Comments

All terms are multiples of 3.

Formula

a(n) == 0 (mod 6), n>1.

Extensions

Edited and extended by R. J. Mathar, Sep 07 2009