A131415 - OEIS

%I #2 Mar 30 2012 17:25:22

%S 1,3,1,6,4,1,11,10,5,1,20,21,15,6,1,37,41,36,21,7,1,70,78,77,57,28,8,

%T 1,135,148,155,134,85,36,9,1,264,283,303,289,219,121,45,10,1,521,547,

%U 586,592,508,340,166,55,11,1

%N (A007318 * A000012) + (A000012 * A007318) - A007318.

%C Left column = A006127: (1, 3, 6, 11, 20, 37,...). Row sums = A047859: (1, 4, 11, 27, 63,...).

%F (A007318 * A000012) + (A000012 * A007318) - A007318 as infinite lower triangular matrices.

%e First few rows of the triangle are:

%e 1;

%e 3, 1;

%e 6, 4, 1;

%e 11, 10, 5, 1;

%e 20, 21, 15, 6, 1;

%e 37, 41, 36, 21, 7, 1;

%e ...

%Y Cf. A007318, A000012, A006127, A047859.

%K nonn,tabl

%O 0,2

%A _Gary W. Adamson_, Jul 08 2007