A296911 Partial sums of A296910.

1, 5, 11, 25, 39, 61, 83, 113, 143, 181, 219, 265, 311, 365, 419, 481, 543, 613, 683, 761, 839, 925, 1011, 1105, 1199, 1301, 1403, 1513, 1623, 1741, 1859, 1985, 2111, 2245, 2379, 2521, 2663, 2813, 2963, 3121, 3279, 3445, 3611, 3785, 3959, 4141, 4323, 4513, 4703, 4901, 5099, 5305, 5511, 5725

Offset: 0

Author

N. J. A. Sloane, Dec 22 2017

Keywords

• nonn

Links

• Robert Israel, Table of n, a(n) for n = 0..10000
• Reticular Chemistry Structure Resource (RCSR), The bew tiling (or net)
• Index entries for linear recurrences with constant coefficients, signature (2, 0, -2, 1).

Programs

Maple

1, seq(2*n^2 + 2*n - (-1)^n,n=1..100); # Robert Israel, Dec 22 2017

Formula

From Robert Israel, Dec 22 2017: (Start)

a(n) = 2*n^2 + 2*n - (-1)^n for n >= 1.

G.f.: (1+3*x+x^2+5*x^3-2*x^4)/((1+x)*(1-x)^3). (End)