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Search: id:A089947
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| A089947 |
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G.f.: (1-x)^9/((1-5*x+6*x^2-4*x^3+x^4)*(-1+4*x-3*x^2+x^3)*(1-3*x+x^2)*(-1+2*x)). |
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+0
3
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| 1, 5, 25, 115, 500, 2092, 8512, 33910, 132892, 514079, 1968021, 7470434, 28160354, 105542777, 393672627, 1462503264, 5414896000, 19991387639, 73628208598, 270614786791, 992880076249, 3637400475618, 13308475404934, 48639360355243, 177597694845849
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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A. Burstein and T. Mansour, Words restricted by 3-letter ..., Annals. Combin., 7 (2003), 1-14; see Th. 3.6, case k=5.
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LINKS
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A. Burstein and T. Mansour, Words restricted by 3-letter ....
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CROSSREFS
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Cf. A061667, A089883, A089932.
Sequence in context: A074419 A092440 A124534 this_sequence A123890 A123894 A055297
Adjacent sequences: A089944 A089945 A089946 this_sequence A089948 A089949 A089950
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KEYWORD
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nonn
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AUTHOR
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njas, Jan 18 2004
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