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A051643
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Central elements in Parker's partition triangle.
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1, 3, 20, 169, 1667, 18084, 208960, 2527074, 31630390, 406680465, 5342750699, 71442850111, 969548468960, 13323571588607, 185072895183632, 2594890728951909, 36681505784903758, 522291180086851188
(list; graph; refs; listen; history; internal format)
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