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A133047
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Starting from the standard 12 against 12 starting position in checkers, the sequence gives the number of unique positions that can arise after n moves.
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2
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1, 7, 49, 216, 805, 2733, 9105, 28123, 85340, 255800, 768155, 2265062, 6588759, 18667410, 51448497, 137051636
(list; graph; refs; listen; history; internal format)
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