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A212693
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Number of legal 7 X 6 Connect-Four positions after n plies.
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6
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1, 7, 49, 238, 1120, 4263, 16422, 54859, 184275, 558186, 1662623, 4568683, 12236101, 30929111, 75437595, 176541259, 394591391, 858218743, 1763883894, 3568259802, 6746155945, 12673345045, 22010823988, 38263228189, 60830813459, 97266114959, 140728569039
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OFFSET
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0,2
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COMMENTS
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Sum of all 43 terms is 4531985219092 as computed by Edelkamp and Kissmann (see link).
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LINKS
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EXAMPLE
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a(3) = 7 * (1*7 + 6*(5/2 + 2)) = 238 because 3 discs played in different columns can be transposed in two ways.
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CROSSREFS
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KEYWORD
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nonn,fini,full
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AUTHOR
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STATUS
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approved
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