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A293724
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Square array A(n,k), n >= 0, k >= 1, read by antidiagonals, where column k is the expansion of e.g.f. exp(Sum_{j=1..k} j^2*x^j).
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6
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1, 1, 1, 1, 1, 1, 1, 1, 9, 1, 1, 1, 9, 25, 1, 1, 1, 9, 79, 241, 1, 1, 1, 9, 79, 457, 1041, 1, 1, 1, 9, 79, 841, 5901, 10681, 1, 1, 1, 9, 79, 841, 7821, 66841, 60649, 1, 1, 1, 9, 79, 841, 10821, 118681, 720259, 658785, 1, 1, 1, 9, 79, 841, 10821, 136681, 1782019
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OFFSET
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0,9
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LINKS
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FORMULA
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A(0,k) = 1 and A(n,k) = (n-1)! * Sum_{j=1..min(k,n)} j^3*A(n-j,k)/(n-j)!.
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EXAMPLE
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Square array begins:
1, 1, 1, 1, 1, ...
1, 1, 1, 1, 1, ...
1, 9, 9, 9, 9, ...
1, 25, 79, 79, 79, ...
1, 241, 457, 841, 841, ...
1, 1041, 5901, 7821, 10821, ...
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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