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A056838 [n^2/9]. 2
0, 0, 0, 1, 1, 2, 4, 5, 7, 9, 11, 13, 16, 18, 21, 25, 28, 32, 36, 40, 44, 49, 53, 58, 64, 69, 75, 81, 87, 93, 100, 106, 113, 121, 128, 136, 144, 152, 160, 169, 177, 186, 196, 205, 215, 225, 235, 245, 256, 266, 277, 289, 300, 312, 324, 336, 348 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Table of n, a(n) for n=0..56.

FORMULA

G.f.: x^3*(1+x)*(x^2-x+1)^2/((1-x)^3*(1+x+x^2)(x^6+x^3+1)). [From R. J. Mathar, Jan 05 2009]

CROSSREFS

Cf. A008740.

Sequence in context: A066026 A112671 A234369 * A045922 A258049 A057352

Adjacent sequences:  A056835 A056836 A056837 * A056839 A056840 A056841

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 02 2000

STATUS

approved

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Last modified March 25 10:23 EDT 2019. Contains 321470 sequences. (Running on oeis4.)