A134390 - OEIS

%I #12 Sep 01 2024 14:05:09

%S 1,4,3,8,8,5,13,14,12,7,19,21,20,16,9,26,29,29,26,20,11,34,38,39,37,

%T 32,24,13,43,48,50,49,45,38,28,15,53,59,62,62,59,53,44,32,17,64,71,75,

%U 76,74,69,61,50,36,19,76,84,89,91,90,86,79,69,56,40,21,89,98,104,107,107,104,98,89,77,62,44,23

%N Duplicate of A131416.

%C Row sums = A127736: (1, 7, 21, 46, 85, 141, 217, ...).

%F (A000012 * A002260 + A002260 * A000012) - A000012 as infinite lower triangular matrices; where A000012 = (1; 1,1; 1,1,1; ...) and A002260 = (1; 1,2; 1,2,3; ...).

%e First few rows of the triangle:

%e    1;

%e    4,  3;

%e    8,  8,  5;

%e   13, 14, 12,  7;

%e   19, 21, 20, 16,  9;

%e   26, 29, 29, 26, 20, 11;

%e   ...

%Y Cf. A002260, A127736.

%K dead

%O 1,2

%A _Gary W. Adamson_, Oct 23 2007

%E a(6) corrected and more terms from _Georg Fischer_, Jun 05 2023