A128187 Matrix product A128174 * A051731 read by rows.

1, 1, 1, 2, 0, 1, 2, 2, 0, 1, 3, 0, 1, 0, 1, 3, 3, 1, 1, 0, 1, 4, 0, 1, 0, 1, 0, 1, 4, 4, 1, 2, 0, 1, 0, 1, 5, 0, 2, 0, 1, 0, 1, 0, 1, 5, 5, 1, 2, 1, 1, 0, 1, 0, 1, 6, 0, 2, 0, 1, 0, 1, 0, 1, 0, 1, 6, 6, 2, 3, 1, 2, 0, 1, 0, 1, 0, 1, 7, 0, 2, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 7, 7, 2, 3, 1, 2, 1, 1

Offset: 1

Author

Gary W. Adamson, Mar 07 2007

Keywords

• nonn
• easy
• tabl

Examples

			First few rows of the triangle are:
1;
1, 1;
2, 0, 1;
2, 2, 0, 1;
3, 0, 1, 0, 1;
3, 3, 1, 1, 0, 1;
4, 0, 1, 0, 1, 0, 1;
4, 4, 1, 2, 0, 1, 0, 1;
...
		

Crossrefs

Cf. A128188 (row sums), A128174, A051731.

Programs

Maple

A128187 := proc(n,k)
    add( A128174(n,j)*A051731(j,k), j=k..n) ;
end proc: # R. J. Mathar, Apr 16 2013

Formula

A128174 * A051731 as infinite lower triangular matrices.