OFFSET
0,2
COMMENTS
The triangular view of A061554 is:
1;
1, 1;
2, 1, 1;
3, 3, 1, 1;
6, 4, 4, 1, 1;
The matrix square of this (infinite) triangle is this triangle here.
EXAMPLE
First few rows of the triangle are:
1;
2, 1;
5, 2, 1;
11, 7, 2, 1;
27, 15, 9, 2, 1;
61, 44, 19, 11, 2, 1;
..,
MAPLE
A061554 := proc(n, k) local m ; m := floor((n+1)/2 - (-1)^(n-k)*(k+1)/2) ; binomial(n, m) ; end proc:
A126125 := proc(n, k) add(A061554(n, j)*A061554(j, k), j=k..n) ; end proc: # R. J. Mathar, Sep 17 2011
CROSSREFS
KEYWORD
AUTHOR
Gary W. Adamson, Dec 17 2006
STATUS
approved