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A000507 Number of permutations of length n by number of runs.
(Formerly M5323 N2314)
+0
3
61, 1385, 19028, 206276, 1949762, 16889786, 137963364, 1081702420, 8236142455, 61386982075 (list; graph; listen)
OFFSET

6,1

REFERENCES

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).

F. N. David, M. G. Kendall and D. E. Barton, Symmetric Function and Allied Tables, Cambridge, 1966, p. 260.

CROSSREFS

Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), May 24 2009: (Start)

The a(n) sequence equals the fourth left hand column of A008971.

The a(2*n) sequence equals the fourth left hand column of A160486.

(End)

Sequence in context: A152868 A154428 A060061 this_sequence A143011 A017777 A113054

Adjacent sequences: A000504 A000505 A000506 this_sequence A000508 A000509 A000510

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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