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Search: id:A106470
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| 1, -1, 1, -1, 0, 1, 1, -1, -1, 1, 1, 0, -1, 0, 1, -1, 1, 1, -1, -1, 1, -1, 0, 1, 0, -1, 0, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, 0, -1, 0, 1, 0, -1, 0, 1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 0, 1, 0, -1, 0, 1, 0, -1, 0, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, 0, -1, 0, 1, 0, -1, 0, 1, 0, -1, 0, 1, -1, 1, 1, -1, -1, 1, 1
(list; table; graph; listen)
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OFFSET
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0,1
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COMMENT
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A 'mixed' sequence array : rows alternate between the rows of the sequence array for the sequence 1,-1,-1,1,1,-1,-1,.. with g.f. (1-x)/(1+x^2) and the sequence array for the sequence 1,0,-1,0,-1,... with g.f. 1/(1+x^2). Column 2k has g.f. x^2k(1-x)/(1+x^2) column 2k+1 has g.f. x^(2k+1)/(1+x^2). Row sums are 1,0,0,0,1,0,0,0,1,.. with g.f. 1/(1-x^4).
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FORMULA
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Triangle begins 1; -1, 1; -1, 0, 1; 1, -1, -1, 1; 1, 0, -1, 0, 1; -1, 1, 1, -1, -1, 1;
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CROSSREFS
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Sequence in context: A047999 A054431 A164381 this_sequence A106465 A099990 A089939
Adjacent sequences: A106467 A106468 A106469 this_sequence A106471 A106472 A106473
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KEYWORD
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sign,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), May 03 2005
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