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

1,2

Links

Table of n, a(n) for n=1..39.

Formula

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

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

Crossrefs

Cf. A086272, A086273.

A005582(n-1) + n.

Sequence in context: A050898 A009845 A014342 * A174121 A128563 A227085

Adjacent sequences: A086271 A086272 A086273 * A086275 A086276 A086277

Keyword

nonn

Author

Clark Kimberling, Jul 14 2003

Status

approved