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A001884 Hit polynomials.
(Formerly M2117 N0835)
+0
2
1, 0, 1, 2, 20, 104, 775, 6140, 55427, 553802, 6087992, 72994152, 948103477, 13262133736, 198769630061, 3177862894922, 53984653965996, 971068821144112, 18438722595913195, 368558842844143268 (list; graph; listen)
OFFSET

1,4

REFERENCES

J. Riordan, ``The enumeration of permutations with three-ply staircase restrictions,'' unpublished memorandum, Bell Telephone Laboratories, Murray Hill, NJ, Oct 1963.

CROSSREFS

Second column of A080018.

Sequence in context: A103101 A009357 A052361 this_sequence A028477 A073077 A069537

Adjacent sequences: A001881 A001882 A001883 this_sequence A001885 A001886 A001887

KEYWORD

nonn,more

AUTHOR

njas

EXTENSIONS

More terms from Vladeta Jovovic and Vladimir Baltic (vladeta(AT)Eunet.yu), Jan 20 2003

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.


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