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A140420
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Binomial transform of 0, 1, 1, 7, 7, 31, 31, ..., zero followed by duplicated A083420.
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2
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0, 1, 3, 13, 45, 151, 483, 1513, 4665, 14251, 43263, 130813, 394485, 1187551, 3570843, 10728913, 32219505, 96724051, 290303223, 871171813, 2614039725, 7843167751, 23531600403, 70598995513, 211805375145, 635432902651
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