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Search: id:A005634
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| A005634 |
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Bishops on an n X n board (see Robinson paper for details).
(Formerly M3621)
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+0
2
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| 0, 0, 1, 4, 28, 85, 630, 3096, 23220, 123952, 1036080, 7230828, 66349440, 500721252, 5080269600, 45925520096, 508031496000, 4919774752448, 59256847036800, 656763354386032, 8532986691801600, 100525956801641104, 1405335512577427200, 18431883446961030912
(list; graph; listen)
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OFFSET
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2,4
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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).
R. W. Robinson, Counting arrangements of bishops, pp. 198-214 of Combinatorial Mathematics IV (Adelaide 1975), Lect. Notes Math., 560 (1976). [The sequence epsilon(n).]
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MAPLE
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For Maple program see A005635.
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CROSSREFS
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Sequence in context: A085001 A153784 A030117 this_sequence A077595 A092712 A058227
Adjacent sequences: A005631 A005632 A005633 this_sequence A005635 A005636 A005637
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KEYWORD
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nonn
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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 N. J. A. Sloane (njas(AT)research.att.com), Sep 28 2006
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