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A027216
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a(n) = Sum{T(n,k)*T(n,k+1), 0<=k<=n-1, T given by A026736.
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0
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1, 4, 15, 63, 237, 1034, 3945, 17577, 67640, 304902, 1179415, 5352038, 20771331, 94628132, 368083879, 1680820301, 6548692260, 29946087674, 116816782997, 534628747310
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