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A011903
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[ n(n-1)(n-2)/21 ].
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0
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0, 0, 0, 0, 1, 2, 5, 10, 16, 24, 34, 47, 62, 81, 104, 130, 160, 194, 233, 276, 325, 380, 440, 506, 578, 657, 742, 835, 936, 1044, 1160, 1284, 1417, 1558, 1709, 1870, 2040, 2220, 2410, 2611, 2822, 3045, 3280
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (3,-3,1,0,0,0,1,-3,3,-1). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 15 2010]
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FORMULA
| a(n) = +3*a(n-1) -3*a(n-2) +a(n-3) +a(n-7) -3*a(n-8) +3*a(n-9) -a(n-10). G.f.: x^4*(x^5-x^4+2*x^2-x+1) / ( (-1+x)^4*(x^6+x^5+x^4+x^3+x^2+x+1) ). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 15 2010]
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CROSSREFS
| Sequence in context: A026056 A084587 A001859 * A078435 A049815 A047992
Adjacent sequences: A011900 A011901 A011902 * A011904 A011905 A011906
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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