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A304080
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Triangular array T(n,k) giving coefficients in expansion of Product_{j=1..n} (1-x^j)^2.
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2
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1, 1, -2, 1, 1, -2, -1, 4, -1, -2, 1, 1, -2, -1, 2, 3, 0, -6, 0, 3, 2, -1, -2, 1, 1, -2, -1, 2, 1, 4, -4, -4, -2, 0, 10, 0, -2, -4, -4, 4, 1, 2, -1, -2, 1, 1, -2, -1, 2, 1, 2, 0, -2, -6, -2, 3, 6, 5, 2, -3, -12, -3, 2, 5, 6, 3, -2, -6, -2, 0, 2, 1, 2, -1, -2, 1
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OFFSET
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0,3
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LINKS
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EXAMPLE
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Irregular triangle starts:
n\k| 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
---+-----------------------------------------------------------------------------
0 | 1;
1 | 1, -2, 1;
2 | 1, -2, -1, 4, -1, -2, 1;
3 | 1, -2, -1, 2, 3, 0, -6, 0, 3, 2, -1, -2, 1;
4 | 1, -2, -1, 2, 1, 4, -4, -4, -2, 0, 10, 0, -2, -4, -4, 4, 1, 2, -1, -2, 1;
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PROG
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(PARI) T(n, k) = polcoef(prod(j=1, n, (1-x^j)^2), k);
tabf(nn) = for(n=0, nn, for(k=0, n*(n+1), print1(T(n, k), ", ")); print)
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CROSSREFS
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KEYWORD
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sign,tabf
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AUTHOR
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STATUS
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approved
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