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Search: id:A002502
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| A002502 |
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Number of connected relations.
(Formerly M5336 N2323)
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+0
14
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| 1, 65, 1795, 36317, 636331, 10365005, 162470155, 2495037197, 37898120011, 572284920845, 8614868501515, 129467758660877, 1943971108806091, 29175170378428685, 437752102106036875, 6567275797761209357
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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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).
G. Kreweras, Inversion des polynomes de Bell bidimensionnels et application au denombrement des relations binaires connexes. C. R. Acad. Sci. Paris Ser. A-B 268 1969 A577-A579.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..100
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FORMULA
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15^n-4*8^n-3*6^n+12*5^n-6*4^n. - Goran Kilibarda, Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 14 2004
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CROSSREFS
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Cf. A005333, A001047, A002501, A093732, A093733.
Sequence in context: A086021 A069424 A086029 this_sequence A095027 A017781 A017728
Adjacent sequences: A002499 A002500 A002501 this_sequence A002503 A002504 A002505
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KEYWORD
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nonn,nice,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Goran Kilibarda, Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 14 2004
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