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A108268
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Column 2 of triangle A108267.
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0
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1, 31, 381, 3431, 26769, 193705, 1343521, 9091270, 60632419, 401001030, 2639871326, 17339260251, 113792427233, 746807661549, 4903854042841, 32227106641988, 211992209767971, 1395903036647155, 9200826759772935
(list; graph; refs; listen; history; internal format)
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