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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 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 May 24 01:29 EDT 2019. Contains 323528 sequences. (Running on oeis4.)