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A003985
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Triangle with subscripts (1,1),(2,1),(1,2),(3,1),(2,2),(1,3), etc. in which entry (i,j) is i AND j.
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3
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1, 0, 0, 1, 2, 1, 0, 2, 2, 0, 1, 0, 3, 0, 1, 0, 0, 0, 0, 0, 0, 1, 2, 1, 4, 1, 2, 1, 0, 2, 2, 4, 4, 2, 2, 0, 1, 0, 3, 4, 5, 4, 3, 0, 1, 0, 0, 0, 4, 4, 4, 4, 0, 0, 0, 1, 2, 1, 0, 5, 6, 5, 0, 1, 2, 1, 0, 2, 2, 0, 0, 6, 6, 0, 0, 2, 2, 0, 1, 0, 3, 0, 1, 0, 7, 0, 1, 0, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
(list; table; graph; refs; listen; history; internal format)
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