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Search: id:A117906
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| 1, -1, 1, 0, 0, 1, 0, -1, 0, 1, 0, 0, 0, -1, 1, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, -1, 0, 1, 0, 0, 0, 0, 0, 0, -1, 1, 0, 0, 0, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, -1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0
(list; table; graph; listen)
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OFFSET
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0,1
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COMMENT
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Row sums are (1,0,1,0,0,0,...) with g.f. 1+x^2. Diagonal sums are A117907.
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FORMULA
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G.f.: (1-x(1-y)+x^2*y^2-x^3*y-x^5*y^2)/(1-x^3*y^3)
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EXAMPLE
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Triangle begins
1,
-1, 1,
0, 0, 1,
0, -1, 0, 1,
0, 0, 0, -1, 1,
0, 0, -1, 0, 0, 1,
0, 0, 0, 0, -1, 0, 1,
0, 0, 0, 0, 0, 0, -1, 1,
0, 0, 0, 0, 0, -1, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, -1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1,
0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 1
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CROSSREFS
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Sequence in context: A074910 A115356 A115359 this_sequence A090678 A110037 A128810
Adjacent sequences: A117903 A117904 A117905 this_sequence A117907 A117908 A117909
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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), Apr 01 2006
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