A127740 - OEIS

%I #13 Jan 03 2025 09:32:48

%S 1,2,4,6,9,15,20,28,40,60,75,100,135,185,260,312,402,522,684,906,1218,

%T 1421,1785,2254,2863,3661,4718,6139,7016,8640,10680,13256,16528,20712,

%U 26104,33120,37260,45153,54873,66888,81801,100395,123696,153063,190323

%N Natural number transform of Aitken's triangle.

%C Left column (1, 2, 6, 20, ...) = A052889.

%C Row sums give A127741.

%F A127648 * A011971 as infinite lower triangular matrices.

%e First few rows of the triangle:

%e    1;

%e    2,   4;

%e    6,   9,  15;

%e   20,  28,  40,  60;

%e   75, 100, 135, 185, 260;

%e   ...

%Y Cf. A005493, A052889, A011971, A127741.

%K nonn,tabl

%O 0,2

%A _Gary W. Adamson_, Jan 27 2007