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Search: id:A027225
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| A027225 |
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a(n) = Sum{T(n,k)*T(n,k+2), 0<=k<=n-2, T given by A026747. |
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+0 1
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| 1, 8, 52, 247, 1416, 6056, 33731, 139016, 770116, 3121259, 17335095, 69642995, 388958218, 1554558921, 8740670953, 34818606079, 197136480944, 783522002716
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