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A026134
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Sum{T(k,k-1)}, k = 1,2,...,n, where T is the array in A026120.
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3
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1, 2, 6, 16, 44, 120, 329, 904, 2493, 6898, 19151, 53340, 149019, 417522, 1172979, 3303696, 9326931, 26390070, 74824584, 212565864, 604972998, 1724739940, 4925066567, 14085122376, 40339596735, 115688495806, 332203673142
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