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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
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.)