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Search: id:A001456
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| A001456 |
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Number of permutations of length n by subsequences.
(Formerly M5183 N2251)
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+0
2
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| 1, 25, 421, 6105, 83029, 1100902, 14516426, 192422979, 2579725656, 35098717902, 485534447114, 6835409506841, 97966603326993, 1429401763567226
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OFFSET
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5,2
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REFERENCES
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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.
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CROSSREFS
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A row of A047874.
Sequence in context: A025975 A025953 A020595 this_sequence A021964 A022456 A020593
Adjacent sequences: A001453 A001454 A001455 this_sequence A001457 A001458 A001459
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KEYWORD
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nonn
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AUTHOR
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njas
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