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A011925
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[ n(n-1)(n-2)(n-3)/15 ].
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0
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0, 0, 0, 0, 1, 8, 24, 56, 112, 201, 336, 528, 792, 1144, 1601, 2184, 2912, 3808, 4896, 6201, 7752, 9576, 11704, 14168, 17001, 20240, 23920, 28080, 32760, 38001, 43848, 50344, 57536, 65472, 74201, 83776
(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.: x^4*(x^4+4*x^3-2*x^2+4*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
| Sequence in context: A054275 A122655 A152134 * A159741 A099041 A129959
Adjacent sequences: A011922 A011923 A011924 * A011926 A011927 A011928
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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