Triangle read by rows: T(n,k)=2^n+2^k-1 with n>=k>=0. 1, 2, 3, 4, 5, 7, 8, 9, 11, 15, 16, 17, 19, 23, 31, 32, 33, 35, 39, 47, 63, 64, 65, 67, 71
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