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A027248
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a(n) = Sum{T(n,k)*T(n,k+1), 0<=k<=n-1, T given by A026780.
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0
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1, 6, 29, 156, 741, 3958, 19233, 103340, 513829, 2782642, 14111035, 76987001, 396866211, 2179190558, 11387537287, 62869497136, 332264796115
(list; graph; refs; listen; history; internal format)
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