OFFSET
0,2
COMMENTS
Row sums are A111966. Factors as (1/(1-x),x/(1-x))*(1/sqrt(1-4x),x/sqrt(1-4x)).
FORMULA
Number triangle T(n, k)=sum{j=0..n, C((k+2j-1)/2, j)C(j, n-j-k)(-6)^(k-n+2j)5^(n-k-j)}
EXAMPLE
1;
3,1;
11,6,1;
45,31,9,1;
195,156,60,12,1;
873,781,360,98,15,1;
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, Aug 23 2005
STATUS
approved