A131227 - OEIS

%I #4 Feb 26 2022 00:34:13

%S 1,2,3,1,2,5,2,1,2,7,1,2,1,2,9,2,1,2,1,2,11,1,2,1,2,1,2,13,2,1,2,1,2,

%T 1,2,15,1,2,1,2,1,2,1,2,17,2,1,2,1,2,1,2,1,2,19

%N 2*A051340 - A128174.

%C Row sums = A047383, numbers congruent to {1,5} mod 7: (1, 5, 8, 12, 15, 19, ...)

%F 2*A051340 - A128174 as infinite lower triangular matrices.

%e First few rows of the triangle:

%e   1;

%e   2, 3;

%e   1, 2, 5;

%e   2, 1, 2, 7;

%e   1, 2, 1, 2, 9;

%e   2, 1, 2, 1, 2, 11;

%e   1, 2, 1, 2, 1,  2, 13;

%e   ...

%Y Cf. A051340, A128174, A047383, A131228, A131229.

%K nonn,tabl

%O 0,2

%A _Gary W. Adamson_, Jun 20 2007