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 A181656 Generalized (conditional) Riordan array with k-th column generated by x^k*(1+x^2) if k mod 2 = 0, x^k*(1+x) otherwise. 1
 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS A181657 is an eigentriangle for this triangle. LINKS Table of n, a(n) for n=0..65. EXAMPLE Triangle begins 1; 0, 1; 1, 1, 1; 0, 0, 0, 1; 0, 0, 1, 1, 1; 0, 0, 0, 0, 0, 1; 0, 0, 0, 0, 1, 1, 1; 0, 0, 0, 0, 0, 0, 0, 1; 0, 0, 0, 0, 0, 0, 1, 1, 1; 0, 0, 0, 0, 0, 0, 0, 0, 0, 1; 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1; Production matrix begins 0, 1; 1, 1, 1; -1, -2, -1, 1; 0, 0, 1, 1, 1; 1, 2, 0, -2, -1, 1; 0, 0, 0, 0, 1, 1, 1; -1, -2, 0, 2, 0, -2, -1, 1; 0, 0, 0, 0, 0, 0, 1, 1, 1; 1, 2, 0, -2, 0, 2, 0, -2, -1, 1; 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1; CROSSREFS Sequence in context: A191232 A267814 A267272 * A090971 A105594 A091949 Adjacent sequences: A181653 A181654 A181655 * A181657 A181658 A181659 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Nov 03 2010 STATUS approved

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Last modified April 24 04:14 EDT 2024. Contains 371918 sequences. (Running on oeis4.)