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