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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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2
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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; refs; listen; history; internal format)
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