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A055903
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Column 7 of triangle A055898.
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0
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1, 15, 141, 939, 4971, 21981, 84351, 287961, 891564, 2539756, 6733764, 16769916, 39526524, 88722756, 190653804, 393952284, 785736369, 1517620599, 2846653381, 5198360739, 9261986019, 16131790389, 27513326919, 46020006201
(list; graph; refs; listen; history; internal format)
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