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A001458 Number of permutations of length n by subsequences.
(Formerly M5297 N2304)
1
1, 49, 1513, 38281, 874886, 18943343, 399080475, 8312317976, 172912977525, 3615907795025, 76340522760097, 1631788075873114, 35378058306185002 (list; graph; refs; listen; history; internal format)
OFFSET

7,2

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: A012238 A036226 A032655 * A004374 A203500 A069327

Adjacent sequences:  A001455 A001456 A001457 * A001459 A001460 A001461

KEYWORD

nonn

AUTHOR

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

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Last modified February 13 16:54 EST 2012. Contains 205523 sequences.