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A013582
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Number of positions in game "Connect Four" (played on usual 6-row, 7-column board) after n moves, up to reflection.
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6
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1, 4, 25, 121, 568, 2144, 8231, 27473, 92244, 279241, 831581, 2284733, 6118941, 15465573, 37720667, 88273017, 197300906, 429114775, 881951878, 1784140720, 3373100313, 6336692489, 11005448210, 19131647821, 30415473928, 48633111249
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OFFSET
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0,2
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LINKS
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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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EXTENSIONS
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a(3)-a(13) corrected by Sean A. Irvine, Aug 09 2018. The corrected values were confirmed by Russ Cox and extended through a(15), Aug 13 2018
a(42) corrected by Sidney Cadot, Dec 04 2022, after comparing results of an independent solver and confirming with Sean A. Irvine that the previously given value was indeed erroneous.
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STATUS
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approved
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