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A001885
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Hit polynomials.
(Formerly M0384 N0144)
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1
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2, 2, 10, 28, 207, 1288, 10366, 91296, 903037, 9832848, 117032570, 1510932116, 21028774738, 313832463386, 4999133311044, 84655108256252, 1518546437350265, 28763765236019284, 573689119174695326
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,1
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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| J. Riordan, The enumeration of permutations with three-ply staircase restrictions, unpublished memorandum, Bell Telephone Laboratories, Murray Hill, NJ, Oct 1963.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
| Third column of A080018.
Sequence in context: A102345 A151364 A200949 * A078433 A059494 A052647
Adjacent sequences: A001882 A001883 A001884 * A001886 A001887 A001888
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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 and Vladimir Baltic (vladeta(AT)eunet.rs), Jan 20 2003
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