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A002024 + A131821 + A007318 - 2*A000012 as infinite lower triangular matrices.
1

%I #5 Mar 05 2022 01:03:00

%S 1,3,3,5,4,5,7,6,6,7,9,8,10,8,9,11,10,15,15,10,11,13,12,21,26,21,12,

%T 13,15,14,28,42,42,28,14,15,17,16,36,64,78,64,36,16,17,19,18,45,93,

%U 135,135,93,45,18,19

%N A002024 + A131821 + A007318 - 2*A000012 as infinite lower triangular matrices.

%C Row sums = A131951: (1, 6, 14, 26, 44, 72, ...).

%e First few rows of the triangle:

%e 1;

%e 3, 3;

%e 5, 4, 5;

%e 7, 6, 6, 7;

%e 9, 8, 10, 8, 9;

%e 11, 10, 15, 15, 10, 11;

%e 13, 12, 21, 26, 21, 12, 13;

%e 15, 14, 28, 42, 42, 28, 14, 15;

%e ...

%Y Cf. A002024, A131821, A007318, A000012, A131951.

%K nonn,tabl

%O 0,2

%A _Gary W. Adamson_, Jul 30 2007