login

%I #4 Feb 20 2022 14:53:19

%S 1,2,1,4,1,1,6,2,1,1,10,2,1,1,1,12,4,2,1,1,1,18,4,2,1,1,1,1,22,6,2,2,

%T 1,1,1,1,28,6,4,2,1,1,1,1,1,32,10,4,2,2,1,1,1,1,1

%N A000012 * A054523.

%C Row sums = the triangular series, A000217: (1, 3, 6, 10, ...).

%C Left column = A002088: (1, 2, 4, 6, 10, 12, 18, ...).

%F A000012 * A054523 as infinite lower triangular matrices.

%e First few rows of the triangle:

%e 1;

%e 2, 1;

%e 4, 1, 1;

%e 6, 2, 1, 1;

%e 10, 2, 1, 1, 1;

%e 12, 4, 2, 1, 1, 1;

%e 18, 4, 2, 1, 1, 1, 1;

%e ...

%Y Cf. A000012, A054523, A000217.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, May 21 2007