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A298485
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Triangle read by rows; row 0 is 1; the n-th row for n>0 contains the coefficients in the expansion of (2-x)*(1+x)^(n-1).
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1
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1, 2, -1, 2, 1, -1, 2, 3, 0, -1, 2, 5, 3, -1, -1, 2, 7, 8, 2, -2, -1, 2, 9, 15, 10, 0, -3, -1, 2, 11, 24, 25, 10, -3, -4, -1, 2, 13, 35, 49, 35, 7, -7, -5, -1, 2, 15, 48, 84, 84, 42, 0, -12, -6, -1, 2, 17, 63, 132, 168, 126, 42, -12, -18, -7, -1, 2, 19, 80, 195, 300, 294, 168, 30, -30, -25, -8, -1
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OFFSET
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0,2
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LINKS
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FORMULA
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T(n,k) = T(n-1,k-1)+T(n-1,k); T(0,0)=1, T(1,0)=2, T(1,1)=-1.
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EXAMPLE
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Triangle begins:
1;
2, -1;
2, 1, -1;
2, 3, 0, -1;
2, 5, 3, -1, -1;
2, 7, 8, 2, -2, -1;
2, 9, 15, 10, 0, -3, -1;
2, 11, 24, 25, 10, -3, -4, -1;
2, 13, 35, 49, 35, 7, -7, -5, -1;
...
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MATHEMATICA
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T[0, 0] = 1; T[_, 0] = 2; T[1, 1] = -1; T[n_?Positive, k_?Positive] := T[n, k] = T[n - 1, k - 1] + T[n - 1, k]; T[_, _] = 0; Table[T[n, k], {n, 0, 11}, {k, 0, n}] // Flatten (* Jean-François Alcover, Feb 05 2018 *)
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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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