A128141 - OEIS

%I #4 Feb 15 2022 01:59:09

%S 1,2,2,3,5,3,4,9,8,4,5,14,15,11,5,6,20,24,21,14,6,7,27,35,34,27,17,7,

%T 8,35,48,50,44,33,20,8,9,44,63,69,65,54,39,23,9,10,54,80,91,90,80,64,

%U 45,26,10

%N A122432 (unsigned) * A128132.

%C Row sums = A006522 starting (1, 4, 11, 25, 50, 91, ...). A128142 = A128132 * A122432.

%F Unsigned A122432 * A128132 as infinite lower triangular matrices; where unsigned A122432 = (1; 3, 1; 6, 3, 1; ...).

%e First few rows of the triangle:

%e   1;

%e   2,  2;

%e   3,  5,  3;

%e   4,  9,  8,  4;

%e   5, 14, 15, 11,  5;

%e   6, 20, 24, 21, 14,  6;

%e   7, 27, 35, 34, 27, 17,  7;

%e   ...

%Y Cf. A122432, A128132, A006522, A128142, A006325.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, Feb 16 2007