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Search: id:A001888
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| A001888 |
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Hit polynomials.
(Formerly M3573 N1449)
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+0
2
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| 1, 1, 1, 4, 21, 122, 849, 6719, 59873, 593686, 6483027, 77309508, 999569969, 13927664613, 208044077633, 3316415176712, 56193522437465, 1008499234742158, 19110533105114433, 381290148293261075
(list; graph; listen)
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OFFSET
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1,4
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
J. Riordan, ``The enumeration of permutations with three-ply staircase restrictions,'' unpublished memorandum, Bell Telephone Laboratories, Murray Hill, NJ, Oct 1963.
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CROSSREFS
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Second column of A080061.
Sequence in context: A046090 A045721 A101810 this_sequence A103769 A003014 A108404
Adjacent sequences: A001885 A001886 A001887 this_sequence A001889 A001890 A001891
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Vladeta Jovovic, Vladimir Baltic, (vladeta(AT)eunet.rs), Jan 23 2003
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