A134676 - OEIS

%I #8 Mar 26 2022 10:21:52

%S 1,3,2,3,0,3,6,6,0,4,3,0,0,0,5,9,6,9,0,0,6,3,0,0,0,0,0,7,10,12,0,12,0,

%T 0,0,8,6,0,9,0,0,0,0,0,9,9,6,0,0,15,0,0,0,0,10

%N A127172 * A127648.

%C Left column = A007425: (1, 3, 3, 6, 3, 9, 3, 10, ...).

%C Row sums = A007430: (1, 5, 6, 16, 8, 30, 10, 42, ...).

%F A127172 * A127648 = A051731^3 * A127648 as infinite lower triangular matrices.

%e First few rows of the triangle:

%e   1;

%e   3, 2;

%e   3, 0, 3;

%e   6, 6, 0, 4;

%e   3, 0, 0, 0, 5;

%e   9, 6, 9, 0, 0, 6;

%e   3, 0, 0, 0, 0, 0, 7;

%e   ...

%Y Cf. A127172, A051731, A127648, A007430, A007425.

%K nonn,tabl,more

%O 1,2

%A _Gary W. Adamson_, Nov 05 2007