OFFSET
0,2
COMMENTS
FORMULA
Column 2k has g.f. x^(2*k)/((1-2*x)*(1-x)^(2*k-2)).
Column 2k+1 has g.f. x^(2*k+1)/((1-2*x)*(1-x)^(2*k)).
EXAMPLE
Triangle begins
1;
2, 1;
4, 2, 1;
8, 4, 4, 1;
16, 8, 11, 4, 1;
32, 16, 26, 11, 6, 1;
64, 32, 57, 26, 22, 6, 1;
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, May 03 2005
STATUS
approved