A104766 - OEIS

%I #7 Mar 30 2012 17:25:11

%S 1,2,1,5,2,1,10,5,2,1,20,10,5,2,1,38,20,10,5,2,1,71,38,20,10,5,2,1,

%T 130,71,38,20,10,5,2,1

%N Triangle T(n,k) = A001629(n-k+2) read by rows, 1<=k<=n.

%C The triangle is the matrix square of the triangle A104762: T(n,k) = sum_{j= k..n} A104762(n,j)*A104762(j,k).

%e First few rows of the triangle:

%e 1;

%e 2, 1;

%e 5, 2, 1;

%e 10, 5, 2, 1;

%e 20, 10, 5, 2, 1;

%e 38, 20, 10, 5, 2, 1;

%e 71, 38, 20, 10, 5, 2, 1;

%e ...

%Y Cf. A001629, A104762, A104763, A006478 (row sums).

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, Mar 24 2005