A134868 - OEIS

%I #13 Mar 27 2022 18:31:55

%S 1,2,2,2,2,3,2,2,3,4,2,2,3,4,5,2,2,3,4,5,6,2,2,3,4,5,6,7,2,2,3,4,5,6,

%T 7,8,2,2,3,4,5,6,7,8,9,2,2,3,4,5,6,7,8,9,10,2,2,3,4,5,6,7,8,9,10,11,2,

%U 2,3,4,5,6,7,8,9,10,11,12,2,2,3,4,5,6,7,8,9,10,11,12,13

%N A103451 * A002260.

%C Row sums = A134869: (1, 4, 7, 11, 16, 22, 29, ...).

%H Michael De Vlieger, <a href="/A134868/b134868.txt">Table of n, a(n) for n = 1..10000</a>

%F A103451 * A002260 as infinite lower triangular matrices.

%F Left border of A002260, (1, 1, 1, 1, ...) is replaced by (1, 2, 2, 2, ...).

%e First few rows of the triangle:

%e   1;

%e   2, 2;

%e   2, 2, 3;

%e   2, 2, 3, 4;

%e   2, 2, 3, 4, 5;

%e   ...

%t Table[k + Boole[k == 1 && n != 2], {n, 2, 14}, {k, n - 1}] // Flatten (* _Michael De Vlieger_, Jul 19 2016 *)

%Y Cf. A002260, A071324, A134869.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, Nov 14 2007