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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. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A057897 A294146 A022758 * A088822 A080182 A001318

Adjacent sequences:  A129229 A129230 A129231 * A129233 A129234 A129235

KEYWORD

nonn

AUTHOR

Clark Kimberling, Apr 04 2007

STATUS

approved

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Last modified September 22 19:36 EDT 2021. Contains 347608 sequences. (Running on oeis4.)