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A026534
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a(n) = Sum{T(i,j)}, 0<=j<=i, 0<=i<=2n, T given by A026519.
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3
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1, 4, 10, 28, 64, 172, 388, 1036, 2332, 6220, 13996, 37324, 83980, 223948, 503884, 1343692, 3023308, 8062156, 18139852, 48372940, 108839116, 290237644, 653034700, 1741425868, 3918208204, 10448555212, 23509249228, 62691331276
(list; graph; refs; listen; history; internal format)
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