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A119302
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Inverse of number triangle binomial(3n-k,n-k).
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2
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1, -3, 1, 0, -5, 1, 0, 7, -7, 1, 0, -3, 18, -9, 1, 0, 0, -22, 33, -11, 1, 0, 0, 13, -65, 52, -13, 1, 0, 0, -3, 75, -140, 75, -15, 1, 0, 0, 0, -51, 238, -255, 102, -17, 1, 0, 0, 0, 19, -266, 570, -418, 133, -19, 1, 0, 0, 0, -3, 196, -882, 1155, -637, 168, -21, 1
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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Riordan array (1-3x,x(1-x)^2); Number triangle T(n,k)=(C(2k,n-k)+3*C(2k,n-k-1))(-1)^(n-k).
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EXAMPLE
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Triangle begins
1,
-3, 1,
0, -5, 1,
0, 7, -7, 1,
0, -3, 18, -9, 1,
0, 0, -22, 33, -11, 1,
0, 0, 13, -65, 52, -13, 1,
0, 0, -3, 75, -140, 75, -15, 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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