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

1,4

Links

Table of n, a(n) for n=1..99.

Formula

A128174 * A051731 as infinite lower triangular matrices.

Example

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;
...

Maple

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

Crossrefs

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

Sequence in context: A062169 A113680 A316723 * A266477 A133121 A091602

Adjacent sequences: A128184 A128185 A128186 * A128188 A128189 A128190

Keyword

nonn,easy,tabl

Author

Gary W. Adamson, Mar 07 2007

Status

approved