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A011930
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[ n(n-1)(n-2)(n-3)/20 ].
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0
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0, 0, 0, 0, 1, 6, 18, 42, 84, 151, 252, 396, 594, 858, 1201, 1638, 2184, 2856, 3672, 4651, 5814, 7182, 8778, 10626, 12751, 15180, 17940, 21060, 24570, 28501, 32886, 37758, 43152, 49104, 55651, 62832
(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+2*x^3+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
| Sequence in context: A074837 A015942 A009945 * A068293 A191101 A184630
Adjacent sequences: A011927 A011928 A011929 * A011931 A011932 A011933
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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