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A068091
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Number of board-pair-pile hexagonal polyominoes with n cells.
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0
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1, 3, 11, 44, 186, 814, 3648, 16611, 76437, 354112, 1647344, 7682237, 35873310, 167625690, 783470179, 3662035980, 17115684065, 79986841677, 373759118882, 1746296080947
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