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A117568
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Riordan array ((1-x^3)/(1+x^2),x).
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2
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1, 0, 1, -1, 0, 1, -1, -1, 0, 1, 1, -1, -1, 0, 1, 1, 1, -1, -1, 0, 1, -1, 1, 1, -1, -1, 0, 1, -1, -1, 1, 1, -1, -1, 0, 1, 1, -1, -1, 1, 1, -1, -1, 0, 1, 1, 1, -1, -1, 1, 1, -1, -1, 0, 1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 0, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 0, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 0, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Inverse of number triangle A117567. Row sums are A117569. Diagonal sums are A102560.
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EXAMPLE
| Triangle begins
1,
0, 1,
-1, 0, 1,
-1, -1, 0, 1,
1, -1, -1, 0, 1,
1, 1, -1, -1, 0, 1,
-1, 1, 1, -1, -1, 0, 1,
-1, -1, 1, 1, -1, -1, 0, 1,
1, -1, -1, 1, 1, -1, -1, 0, 1
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CROSSREFS
| Sequence in context: A175192 A088150 A117567 * A093521 A167364 A000480
Adjacent sequences: A117565 A117566 A117567 * A117569 A117570 A117571
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KEYWORD
| easy,sign,tabl
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Mar 29 2006
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