%I A143620
%S A143620 1,1,0,2,0,0,2,1,0,0,4,1,1,0,0,2,1,1,1,0,0,6,2,2,1,1,0,0,4,3,2,2,1,1,0,
%T A143620 0,6,2,4,2,2,1,1,0,0,4,3,1,2,2,1,1,1,0,0,10,4,5,3,4,1,3,1,1,0,0,4,3,3,
               3,
%U A143620 2,2,1,1,1,1,0,0
%N A143620 Triangle read by rows, square of A054521, 1<=k<=n.
%C A143620 Left border = phi(n), A000010.
%C A143620 Row sums = A053570: (1, 1, 2, 3, 6, 5, 12, 13,...).
%F A143620 Triangle read by rows, square of A054521, 1<=k<=n
%e A143620 First few rows of the triangle =
%e A143620 1;
%e A143620 1, 0;
%e A143620 2, 0, 0;
%e A143620 2, 1, 0, 0;
%e A143620 4, 1, 1, 0, 0;
%e A143620 2, 1, 1, 1, 0, 0;
%e A143620 6, 2, 2, 1, 1, 0, 0;
%e A143620 4, 3, 2, 2, 1, 1, 0, 0;
%e A143620 6, 2, 4, 2, 2, 1, 1, 0, 0;
%e A143620 ...
%Y A143620 Cf. A054521, A000010, A053570.
%Y A143620 Sequence in context: A025436 A134109 A161364 this_sequence A025843 A035437 
               A156996
%Y A143620 Adjacent sequences: A143617 A143618 A143619 this_sequence A143621 A143622 
               A143623
%K A143620 nonn
%O A143620 1,4
%A A143620 Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 27 2008