OFFSET
0,4
COMMENTS
A Jacobsthal related number number triangle.
LINKS
Seiichi Manyama, Rows n = 0..139, flattened
FORMULA
k-th column has g.f. 1/(1-x-2x^2) * ( x*(1-2x^2)/(1-x-2x^2) )^k.
EXAMPLE
Rows begin:
1,
1, 1,
3, 2, 1,
5, 5, 3, 1,
11, 12, 8, 4, 1,
21, 27, 22, 12, 5, 1,
43, 62, 55, 36, 17, 6, 1,
85, 137, 137, 99, 55, 23, 7, 1,
...
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, Jan 23 2004
STATUS
approved