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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: A136705 A141646 A129573 * A071024 A071037 A118172 Adjacent sequences:  A181649 A181650 A181651 * A181653 A181654 A181655 KEYWORD easy,sign,tabl AUTHOR Paul Barry, Nov 03 2010 STATUS approved

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Last modified October 14 18:28 EDT 2019. Contains 328022 sequences. (Running on oeis4.)