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A167655
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Riordan array (1-u,u) where u=x/(1+x+x^2).
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0
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1, -1, 1, 1, -2, 1, 0, 2, -3, 1, -1, 0, 4, -4, 1, 1, -3, -1, 7, -5, 1, 0, 4, -6, -4, 11, -6, 1, -1, -1, 11, -9, -10, 16, -7, 1, 1, -4, -6, 24, -10, -20, 22, -8, 1, 0, 6, -9, -21, 44, -6, -35, 29, -9, 1, -1, -2, 21, -12, -55, 70, 7, -56, 37, -10, 1
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OFFSET
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0,5
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COMMENTS
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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(n-2,k), T(0,0) = T(1,1) = T(2,0) = T(2,2) = 1, T(1,0) = -1, T(2,1) = -2, T(n,k) = 0 if k<0 or if k>n. - Philippe Deléham, Jan 22 2014
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EXAMPLE
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Triangle begins:
1;
-1, 1;
1, -2, 1;
0, 2, -3, 1;
-1, 0, 4, -4, 1;
1, -3, -1, 7, -5, 1;
0, 4, -6, -4, 11, -6, 1;
-1, -1, 11, -9, -10, 16, -7, 1;
1, -4, -6, 24, -10, -20, 22, -8, 1;
0, 6, -9, -21, 44, -6, -35, 29, -9, 1;
-1, -2, 21, -12, -55, 70, 7, -56, 37, -10, 1;
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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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