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A061706
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G.f.: x^2*(x-1)^8/(4*x^9+x^8-79*x^7+166*x^6-225*x^5+206*x^4-129*x^3+50*x^2-11*x+1).
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0
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0, 0, 1, 3, 11, 44, 185, 805, 3552, 15671, 68827, 301108, 1314553, 5735237, 25024104, 109216135, 476775195, 2081568940, 9088283129, 39679791093, 173240442512, 756351086215, 3302134987931, 14416689863220, 62941426366169
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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REFERENCES
| R. P. Stanley, Enumerative Combinatorics I, 4.7.19.
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FORMULA
| a(n) = 11*a(n - 1) - 50*a(n - 2) + 129*a(n - 3) - 206*a(n - 4) + 225*a(n - 5) - 166*a(n - 6) + 79*a(n - 7) - a(n - 8) - 4*a(n - 9) for n >= 11.
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CROSSREFS
| Cf. A001169.
Sequence in context: A091200 A151105 A127632 * A167012 A167013 A121220
Adjacent sequences: A061703 A061704 A061705 * A061707 A061708 A061709
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KEYWORD
| nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 18 2001
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