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A049827
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a(n)=T(2n-1,n)+T(2n,n+1)+...+T(3n-3,2n-2)=sum over a period of n-th diagonal of array T given by A049816.
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0
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0, 1, 3, 6, 8, 13, 13, 20, 22, 25, 27, 38, 32, 45, 45, 46, 50, 63, 59, 74, 64, 71, 77, 96
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