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A144220
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Triangle read by rows, A118433 (the self-inverse triangle) * A000012^(-1).
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0
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1, 2, -1, -3, 1, 1, -4, 0, 4, -1, 5, 2, -10, 3, 1, 6, 5, -20, 5, 6, -1, -7, -9, 35, 5, -21, 5, 1, -8, -14, 56, 0, -56, 14, 8, -1, 9, 20, -84, -14, 126, -28, -36, 7, 1, 10, 27, -120, -42, 252, -42, -120, 27, 10, -1, -11, -35, 165, 90, -462, 42, 330, -75, -55, 9, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Row sums = (1, 1, -1, -1, 1, 1,...).
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FORMULA
| A118433 * A000012^(-1), where A000012^(-1) = an infinite lower triangular matrix with 1's in the main diagonal and (-1)'s in the sub diagonal, with the rest zeros.
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EXAMPLE
| First few rows of the triangle =
1;
2, -1;
3, 1, 1;
-4, 0, 4, -1
5, 2, -10, 3, 1;
6, 5, -20, 5, 6, -1;
-7, -9, 35, -5, -21, 5, 1;
-8, -14, 56, 0, -56, 14, 8, -1;
9, 20, -84, -14, 126, -28, -36, 7, 1;
10, 27, -120, -42, 252, -42, -120, 27, 10, -1;
...
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CROSSREFS
| A118433
Sequence in context: A186007 A006346 A088742 * A156826 A130296 A126705
Adjacent sequences: A144217 A144218 A144219 * A144221 A144222 A144223
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KEYWORD
| tabl,sign
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 14 2008
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