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A026079
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a(n) = Sum{T(k,k-1)}, k = 1,2,...,n, where T is the array defined in A024996.
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0
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1, 3, 6, 12, 31, 83, 233, 661, 1893, 5445, 15720, 45510, 132069, 384049, 1118822, 3264644, 9539789, 27913085, 81769238, 239794424, 703906721, 2068153901, 6081507833, 17896695833, 52703944967, 155310270103, 457956633828, 1351132539606, 3988457429607
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