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A001888 Hit polynomials.
(Formerly M3573 N1449)
1
1, 1, 1, 4, 21, 122, 849, 6719, 59873, 593686, 6483027, 77309508, 999569969, 13927664613, 208044077633, 3316415176712, 56193522437465, 1008499234742158, 19110533105114433, 381290148293261075, 7989548583615385153, 175418232627066361514, 4027213499971769192903, 96489861550805864197512 (list; graph; refs; listen; history; text; internal format)
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J. Riordan, The enumeration of permutations with three-ply staircase restrictions, unpublished memorandum, Bell Telephone Laboratories, Murray Hill, NJ, Oct 1963. (See A001883)
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).
LINKS
N. J. A. Sloane, Annotated copy of Riordan's Three-Ply Staircase paper (unpublished memorandum, Bell Telephone Laboratories, Murray Hill, NJ, Oct 1963)
CROSSREFS
Second column of A080061.
Sequence in context: A274969 A236525 A277292 * A103769 A003014 A108404
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Vladeta Jovovic, Vladimir Baltic, Jan 23 2003
a(21)-a(24) from Vaclav Kotesovec, Oct 10 2017
STATUS
approved

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Last modified July 25 03:25 EDT 2024. Contains 374586 sequences. (Running on oeis4.)