A131231 - OEIS

%I #4 Feb 26 2022 00:34:57

%S 1,6,1,7,3,1,12,1,3,1,13,3,1,3,1,18,1,3,1,3,1,19,3,1,3,1,3,1,24,1,3,1,

%T 3,1,3,1,25,3,1,3,1,3,1,3,1

%N 3*A130296 - 2*A128174.

%C Left column = A047225, numbers congruent to {0,1} mod 6: (1, 6, 7, 12, 13, 18, 19, ...).

%C Row sums = A131229, numbers congruent to {1,7} mod 10: (1, 7, 11, 17, ...).

%F 3*A130296 - 2*A128174 as infinite lower triangular matrices.

%e First few rows of the triangle:

%e    1;

%e    6, 1;

%e    7, 3, 1;

%e   12, 1, 3, 1;

%e   13, 3, 1, 3, 1;

%e   ...

%Y Cf. A131229, A047225, A130296, A128174.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, Jun 20 2007