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Search: id:A091698
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| 1, -1, 1, 1, -3, 1, -1, 8, -5, 1, 1, -23, 19, -7, 1, -1, 74, -69, 34, -9, 1, 1, -262, 256, -147, 53, -11, 1, -1, 993, -986, 615, -265, 76, -13, 1, 1, -3943, 3935, -2571, 1235, -431, 103, -15, 1, -1, 16178, -16169, 10862, -5591, 2216, -653, 134, -17, 1, 1
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Riordan array (1/(1+x), (sqrt(1+6x+5x^2)-x-1)/(2(1+x))). The absolute value array is (1/(1-x),xc(x)/(1-xc(x))) where c(x) is the g.f. of A000108. It factorizes as (1/(1-x),x/(1-x))(1,xc(x)). - Paul Barry (pbarry(AT)wit.ie), Jun 10 2005
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EXAMPLE
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1; -1,1; 1,-3,1; -1,8,-5,1; 1,-23,19,-7,1; ...
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CROSSREFS
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Row sums: A091699. Row sums (absolute values): A007317. Column 1: A050511.
Sequence in context: A098747 A122897 A117425 this_sequence A134380 A124469 A094816
Adjacent sequences: A091695 A091696 A091697 this_sequence A091699 A091700 A091701
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KEYWORD
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sign,tabl
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Jan 29 2004
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