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A026551
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a(n) = Sum{T(i,j)}, 0<=j<=i, 0<=i<=2n, T given by A026536.
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3
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3, 9, 21, 57, 129, 345, 777, 2073, 4665, 12441, 27993, 74649, 167961, 447897, 1007769, 2687385, 6046617, 16124313, 36279705, 96745881, 217678233, 580475289, 1306069401, 3482851737, 7836416409, 20897110425, 47018498457
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