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A011940
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[ n(n-1)(n-2)(n-3)/30 ].
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0
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0, 0, 0, 0, 0, 4, 12, 28, 56, 100, 168, 264, 396, 572, 800, 1092, 1456, 1904, 2448, 3100, 3876, 4788, 5852, 7084, 8500, 10120, 11960, 14040, 16380, 19000, 21924, 25172, 28768, 32736, 37100, 41888, 47124
(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 (4,-6,4,-1,1,-4,6,-4,1). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 15 2010]
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FORMULA
| a(n) = +4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +a(n-5) -4*a(n-6) +6*a(n-7) -4*a(n-8) +a(n-9). G.f.: 4*x^5*(x^2-x+1) / ((1-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
| Equals 4 * A011795.
Sequence in context: A006000 A161216 A085622 * A102653 A102650 A011939
Adjacent sequences: A011937 A011938 A011939 * A011941 A011942 A011943
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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