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A001890
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Hit polynomials.
(Formerly M4696 N2005)
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1
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1, 10, 34, 206, 1351, 10543, 92708, 912884, 9917445, 117838808, 1519483258, 21128310078, 315093762147, 5016410089130, 84909414423784, 1522548805068310, 28830824064870329, 574880701875755325
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,2
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REFERENCES
| J. Riordan, ``The enumeration of permutations with three-ply staircase restrictions,'' unpublished memorandum, Bell Telephone Laboratories, Murray Hill, NJ, Oct 1963.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Fourth column of A080061.
Sequence in context: A068078 A067806 A001446 * A010818 A065195 A115149
Adjacent sequences: A001887 A001888 A001889 * A001891 A001892 A001893
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Vladeta Jovovic, Vladimir Baltic, (vladeta(AT)eunet.rs), Jan 23 2003
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