A129237 - OEIS

%I #4 Feb 18 2022 22:30:54

%S 1,3,2,4,0,3,7,5,0,4,6,0,0,0,5,12,6,7,0,0,6,8,0,0,0,0,0,7,15,10,0,9,0,

%T 0,0,8,13,0,8,0,0,0,0,0,9,18,8,0,0,11,0,0,0,0,10

%N A051731 * A129234.

%C Left border = Sigma(n), A000203: (1, 3, 4, 7, 6, 12, 8, ...). A129236 = Moebius transform of A129234.

%F A051731 * A129234 as infinite lower triangular matrices.

%e First few rows of the triangle:

%e    1;

%e    3,  2;

%e    4,  0, 3;

%e    7,  5, 0, 4;

%e    6,  0, 0, 0, 5;

%e   12,  6, 7, 0, 0, 6;

%e    8,  0, 0, 0, 0, 0, 7;

%e   15, 10, 0, 9, 0, 0, 0, 8;

%e   ...

%Y Cf. A129234, A129235, A129236, A054525, A051731, A000203.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, Apr 05 2007