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Search: id:A027203
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| A027203 |
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a(n) = Sum{T(n,k)*T(n,k+2), 0<=k<=n-2, T given by A026202. |
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| 1, 10, 75, 450, 2814, 15202, 89623, 466252, 2677281, 13691160, 77546684, 393047294, 2209036094, 11140807218, 62325916869, 313402240000
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