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Search: id:A123071
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| A123071 |
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Bishops on a 2n+1 X 2n+1 board (see Robinson paper for details). |
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+0
3
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| 1, 2, 4, 12, 36, 120, 400, 1520, 5776, 23712, 97344, 431808, 1915456, 9012608, 42406144, 210988800, 1049760000, 5475340800, 28558296064, 155672726528, 848579961856, 4810614454272, 27271456395264, 160376430784512, 943132599095296, 5735299537018880
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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R. W. Robinson, Counting arrangements of bishops, pp. 198-214 of Combinatorial Mathematics IV (Adelaide 1975), Lect. Notes Math., 560 (1976). [The sequence S(2k+1).]
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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: A054542 A117757 A009623 this_sequence A048116 A009152 A081443
Adjacent sequences: A123068 A123069 A123070 this_sequence A123072 A123073 A123074
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KEYWORD
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nonn
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AUTHOR
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njas, Sep 28 2006
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