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A027136
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a(n) = Sum{T(n,k)*T(n,2n-k)}, 0<=k<=n-1, T given by A027113.
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0
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2, 7, 30, 131, 538, 2153, 8441, 32484, 123292, 462673, 1719899, 6343170, 23237876, 84641287, 306758202, 1106900323, 3978716442, 14252356483, 50897604269, 181263039820, 643928439234, 2282348057593, 8072881497390
(list; graph; refs; listen; history; internal format)
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