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Search: id:A110168
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| A110168 |
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Riordan array ((1-x^2)/(1+3x+x^2),x/(1+3x+x^2)). |
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+0
3
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| 1, -3, 1, 7, -6, 1, -18, 24, -9, 1, 47, -84, 50, -12, 1, -123, 275, -225, 85, -15, 1, 322, -864, 900, -468, 129, -18, 1, -843, 2639, -3339, 2219, -840, 182, -21, 1, 2207, -7896, 11756, -9528, 4610, -1368, 244, -24, 1, -5778, 23256, -39825, 38121, -22518, 8532, -2079, 315, -27, 1, 15127, -67650, 130975
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Inverse of A110165. Row sums are 1,-2,2,-2,... with g.f. (1-x)/(1+x). Diagonal sums are (-1)^n*A080923. Product of A110162 and inverse binomial transform (1/(1+x),x/(1+x)).
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EXAMPLE
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Rows begin
1;
-3,1;
7,-6,1;
-18,24,-9,1;
47,-84,50,-12,1;
-123,275,-225,85,-15,1;
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CROSSREFS
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Sequence in context: A110441 A111806 A054458 this_sequence A046913 A118228 A082053
Adjacent sequences: A110165 A110166 A110167 this_sequence A110169 A110170 A110171
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KEYWORD
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easy,sign,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jul 14 2005
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