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A022818
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Triangle read by rows: T(n,k) = number of terms in n-th derivative of a function composed with itself k times.
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6
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1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 6, 5, 1, 1, 5, 10, 13, 7, 1, 1, 6, 15, 26, 23, 11, 1, 1, 7, 21, 45, 55, 44, 15, 1, 1, 8, 28, 71, 110, 121, 74, 22, 1
(list; table; graph; refs; listen; history; internal format)
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