OFFSET
0,2
COMMENTS
Riordan array ((1-x)/(1-3x+x^2), x^2/(1-3x+x^2)) .
FORMULA
EXAMPLE
Triangle begins :
1
2, 0
5, 1, 0
13, 5, 0, 0
34, 19, 1, 0, 0
89, 65, 8, 0, 0, 0
233, 210, 42, 1, 0, 0, 0
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Philippe Deléham, Dec 14 2011
STATUS
approved