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A117185
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Riordan array ((1-x^2)/(1+x+2x^2+x^3+x^4),x/(1+x^2)).
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2
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1, -1, 1, -2, -1, 1, 3, -3, -1, 1, 1, 4, -4, -1, 1, -4, 4, 5, -5, -1, 1, 1, -8, 8, 6, -6, -1, 1, 3, -3, -13, 13, 7, -7, -1, 1, -2, 11, -11, -19, 19, 8, -8, -1, 1, -1, 1, 24, -24, -26, 26, 9, -9, -1, 1, 1, -12, 12, 43, -43, -34, 34, 10, -10, -1, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| Row sums are A117188. Diagonal sums are A099837. Inverse of A117184.
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EXAMPLE
| Triangle begins
1,
-1, 1,
-2, -1, 1,
3, -3, -1, 1,
1, 4, -4, -1, 1,
-4, 4, 5, -5, -1, 1,
1, -8, 8, 6, -6, -1, 1,
3, -3, -13, 13, 7, -7, -1, 1
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CROSSREFS
| Sequence in context: A034931 A090402 A026082 * A129181 A157694 A093557
Adjacent sequences: A117182 A117183 A117184 * A117186 A117187 A117188
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KEYWORD
| easy,sign,tabl
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Mar 01 2006
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