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Search: id:A002874
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| A002874 |
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Sorting numbers.
(Formerly M1863 N0738)
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+0
2
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| 1, 2, 8, 42, 268, 1994, 16852, 158778, 1644732, 18532810, 225256740, 2933174842, 40687193548, 598352302474, 9290859275060, 151779798262202, 2600663778494172, 46609915810749130, 871645673599372868
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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T. S. Motzkin, Sorting numbers ...: for a link to this paper see A000262.
T. S. Motzkin, Sorting numbers for cylinders and other classification numbers, in Combinatorics, Proc. Symp. Pure Math. 19, AMS, 1971, pp. 167-176.
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..100
Index entries for sequences related to sorting
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FORMULA
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E.g.f.: exp (( exp(3*x) - 4) / 3 + exp(x) ).
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CROSSREFS
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Sequence in context: A054993 A005315 A121635 this_sequence A078592 A052646 A002856
Adjacent sequences: A002871 A002872 A002873 this_sequence A002875 A002876 A002877
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KEYWORD
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nonn,easy,nice
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AUTHOR
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njas, Simon Plouffe (plouffe(AT)math.uqam.ca)
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