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A296911
Partial sums of A296910.
2
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
0,2
LINKS
Reticular Chemistry Structure Resource (RCSR), The bew tiling (or net)
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)
MAPLE
1, seq(2*n^2 + 2*n - (-1)^n, n=1..100); # Robert Israel, Dec 22 2017
CROSSREFS
Sequence in context: A021008 A266905 A059358 * A167238 A084640 A337481
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 22 2017
STATUS
approved