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A333925
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Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of Product_{j=2..k+1} 1/(1 - x^j).
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1
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1, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 2, 1, 1, 0, 1, 0, 1, 1, 2, 1, 2, 0, 0, 1, 0, 1, 1, 2, 2, 3, 1, 1, 0, 1, 0, 1, 1, 2, 2, 3, 2, 2, 0, 0, 1, 0, 1, 1, 2, 2, 4, 3, 4, 2, 1, 0, 1, 0, 1, 1, 2, 2, 4, 3, 5, 3, 2, 0, 0, 1, 0, 1, 1, 2, 2, 4, 4, 6, 5, 5, 2, 1, 0
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OFFSET
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0,33
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COMMENTS
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A(n,k) is the number of partitions of n into parts 2, 3, ..., k and k + 1.
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LINKS
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FORMULA
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G.f. of column k: Product_{j=2..k+1} 1/(1 - x^j).
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EXAMPLE
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Square array begins:
1, 1, 1, 1, 1, 1, ...
0, 0, 0, 0, 0, 0, ...
0, 1, 1, 1, 1, 1, ...
0, 0, 1, 1, 1, 1, ...
0, 1, 1, 2, 2, 2, ...
0, 0, 1, 1, 2, 2, ...
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MATHEMATICA
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Table[Function[k, SeriesCoefficient[Product[1/(1 - x^j), {j, 2, k + 1}], {x, 0, n}]][i - n], {i, 0, 13}, {n, 0, i}] // Flatten
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CROSSREFS
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Columns k=0..12 give A000007, A059841, A103221, A266755, A008667, A037145, A001996, A266776, A266777, A266778, A266779, A266780, A266781.
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KEYWORD
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AUTHOR
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STATUS
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approved
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