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Search: id:A011849
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| 0, 0, 0, 0, 1, 3, 6, 11, 18, 28, 40, 55, 73, 95, 121, 151, 186, 226, 272, 323, 380, 443, 513, 590, 674, 766, 866, 975, 1092, 1218, 1353, 1498, 1653, 1818, 1994, 2181, 2380, 2590, 2812, 3046, 3293, 3553, 3826
(list; graph; listen)
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OFFSET
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0,6
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FORMULA
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G.f.: [x^4(1-x+x^2)(1-x^2+x^3)]/[(1-x)^3*(1-x^9)]. - R. Stephan, Mar 05 2004
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MAPLE
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seq(floor(binomial(n, 3)/3), n=0..42); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 12 2009]
seq(floor(binomial(n, 3)/3) , n=0..42); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 12 2009]
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CROSSREFS
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A column of triangle A011857.
Sequence in context: A010000 A014125 A147456 this_sequence A095944 A014284 A118482
Adjacent sequences: A011846 A011847 A011848 this_sequence A011850 A011851 A011852
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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