A086274 Antidiagonal sums of A086272 (and of A086273).

1, 4, 12, 29, 60, 111, 189, 302, 459, 670, 946, 1299, 1742, 2289, 2955, 3756, 4709, 5832, 7144, 8665, 10416, 12419, 14697, 17274, 20175, 23426, 27054, 31087, 35554, 40485, 45911, 51864, 58377, 65484, 73220, 81621, 90724, 100567, 111189

Offset: 1

Author

Clark Kimberling, Jul 14 2003

Keywords

• nonn

Crossrefs

Cf. A086272, A086273.

A005582(n-1) + n.

Formula

a(n)=n+Sum{(k+1)C(n+1-k, 2): k=1, 2, ..., n}.

n(n^3+6n^2-n+18)/24.