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A128187
Matrix product A128174 * A051731 read by rows.
3
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
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
KEYWORD
nonn,easy,tabl
AUTHOR
Gary W. Adamson, Mar 07 2007
STATUS
approved