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A001456 Number of permutations of length n by subsequences.
(Formerly M5183 N2251)
1
1, 25, 421, 6105, 83029, 1100902, 14516426, 192422979, 2579725656, 35098717902, 485534447114, 6835409506841, 97966603326993, 1429401763567226 (list; graph; refs; listen; history; internal format)
OFFSET

5,2

REFERENCES

Baer, R. M.; Brock, P.; Natural sorting over permutation spaces. Math. Comp. 22 1968 385-410.

J. M. Hammersley, A few seedings of research, in Proc. Sixth Berkeley Sympos. Math. Stat. and Prob., ed. L. M. le Cam et al., Univ. Calif. Press, 1972, Vol. I, pp. 345-394.

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).

CROSSREFS

A row of A047874.

Sequence in context: A025975 A025953 A020595 * A021964 A022456 A020593

Adjacent sequences:  A001453 A001454 A001455 * A001457 A001458 A001459

KEYWORD

nonn

AUTHOR

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

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Last modified February 16 11:25 EST 2012. Contains 205907 sequences.