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A181652 Inverse of number triangle A181651. 1
1, -1, 1, -1, -1, 1, -1, 0, -1, 1, -1, 0, -1, -1, 1, -1, 0, -1, 0, -1, 1, -1, 0, -1, 0, -1, -1, 1, -1, 0, -1, 0, -1, 0, -1, 1, -1, 0, -1, 0, -1, 0, -1, -1, 1, -1, 0, -1, 0, -1, 0, -1, 0, -1, 1, -1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
0,1
COMMENTS
Generalized (conditional) Riordan array with k-th column generated by x^k*if(mod(k,2)=0,(1-2x)/(1-x),1-x).
LINKS
EXAMPLE
Triangle begins
1,
-1, 1,
-1, -1, 1,
-1, 0, -1, 1,
-1, 0, -1, -1, 1,
-1, 0, -1, 0, -1, 1,
-1, 0, -1, 0, -1, -1, 1,
-1, 0, -1, 0, -1, 0, -1, 1,
-1, 0, -1, 0, -1, 0, -1, -1, 1,
-1, 0, -1, 0, -1, 0, -1, 0, -1, 1,
-1, 0, -1, 0, -1, 0, -1, 0, -1, -1, 1
Production matrix begins
-1, 1,
0, -2, 1,
1, 0, -2, 1,
1, -1, 0, -2, 1,
2, -1, 1, 0, -2, 1,
2, -1, 1, -1, 0, -2, 1,
3, -1, 2, -1, 1, 0, -2, 1,
3, -1, 2, -1, 1, -1, 0, -2, 1,
4, -1, 3, -1, 2, -1, 1, 0, -2, 1
CROSSREFS
Cf. A070909.
Sequence in context: A141646 A129573 A330887 * A071024 A337263 A071037
KEYWORD
easy,sign,tabl
AUTHOR
Paul Barry, Nov 03 2010
STATUS
approved

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Last modified March 28 07:18 EDT 2024. Contains 371235 sequences. (Running on oeis4.)