A143316 - OEIS

%I #6 Aug 14 2023 06:53:35

%S 1,2,1,4,0,1,4,2,0,1,8,0,0,0,1,4,4,2,0,0,1,12,0,0,0,0,0,1,8,4,0,2,0,0,

%T 0,1,12,0,4,0,0,0,0,0,1,8,8,0,0,2,0,0,0,0,1,20,0,0,0,0,0,0,0,0,0,1,8,

%U 4,4,4,0,2,0,0,0,0,0,1,24,0,0,0,0,0,0,0,0,0,0,0,1,12,12,0,0,0,0,2,0,0,0,0,0,0,1

%N Triangle read by rows, A054525 * A143315, 1<=k<=n.

%C Row sums = 2*n-1.

%C Left border = A140434: (1, 2, 4, 4, 8, 4, 12, 8,...).

%e First few rows of the triangle =

%e 1;

%e 2, 1;

%e 4, 0, 1;

%e 4, 2, 0, 1;

%e 8, 0, 0, 0, 1;

%e 4, 4, 2, 0, 0, 1;

%e 12, 0, 0, 0, 0, 0, 1;

%e 8, 4, 0, 2, 0, 0, 0, 1;

%e ...

%Y Cf. A054525, A140434, A143315.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, Aug 06 2008

%E a(19) corrected and more terms from _Georg Fischer_, Aug 14 2023