A131350 - OEIS

%I #7 May 15 2017 18:24:34

%S 1,2,1,1,4,1,2,4,6,1,1,8,9,8,1,2,7,20,16,10,1,1,12,24,40,25,12,1,2,10,

%T 42,60,70,36,14,1,1,16,46,112,125,112,49,16,1,2,13,72,148,252,231,168,

%U 64,18,1

%N 2*A007318 - A049310 as infinite lower triangular matrices.

%C Row sums = A099036 starting (1, 3, 6, 13, 27, 56, 115,...).

%e First few rows of the triangle are:

%e 1;

%e 2, 1;

%e 1, 4, 1;

%e 2, 4, 6, 1;

%e 1, 8, 9, 8, 1;

%e 2, 7, 20, 16, 10, 1;

%e 1, 12, 24, 40, 25, 12, 1;

%e ...

%Y Cf. A007318, A049310, A131350.

%K nonn,tabl

%O 0,2

%A _Gary W. Adamson_, Jul 02 2007