A129232 a(n)=Floor(n*r)+Floor((n-2)*r)+Floor((n-4)*r)+...+Floor(k*r), where r = 2^(1/2) and k=0 if n is even, k=1 if n is odd.

0, 1, 2, 5, 7, 12, 15, 21, 26, 33, 40, 48, 56, 66, 75, 87, 97, 111, 122, 137, 150, 166, 181, 198, 214, 233, 250, 271, 289, 312, 331, 355, 376, 401, 424, 450, 474, 502, 527, 557, 583, 614, 642, 674, 704, 737, 769, 803, 836, 872, 906, 944, 979, 1018, 1055, 1095

Offset

0,3

Links

Table of n, a(n) for n=0..55.

Formula

a(n) = sum(A129231(k): k=0,1,...,n).

Crossrefs

Cf. A129231.

Sequence in context: A294146 A022758 A349744 * A088822 A080182 A001318

Adjacent sequences: A129229 A129230 A129231 * A129233 A129234 A129235

Keyword

nonn

Author

Clark Kimberling, Apr 04 2007

Status

approved