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A011921
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[ n(n-1)(n-2)(n-3)/11 ].
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0
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0, 0, 0, 0, 2, 10, 32, 76, 152, 274, 458, 720, 1080, 1560, 2184, 2978, 3970, 5192, 6676, 8456, 10570, 13058, 15960, 19320, 23184, 27600, 32618, 38290, 44672, 51820, 59792, 68650, 78458, 89280, 101184
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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FORMULA
| a(n) = +4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +a(n-11) -4*a(n-12) +6*a(n-13) -4*a(n-14) +a(n-15). G.f.: 2*x^4*(1+x+2*x^2+x^4+2*x^5+x^6+2*x^8+x^9+x^10) / ( (1-x)^5*(1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10) ). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 15 2010]
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CROSSREFS
| Sequence in context: A197452 A050927 A197302 * A103290 A131068 A034555
Adjacent sequences: A011918 A011919 A011920 * A011922 A011923 A011924
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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