%I #2 Mar 30 2012 17:34:03
%S 1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,0,1,1,0,0,1,1,1,1,1,
%T 1,1,1,1,1,0,1,1,0,0,1,1,0,0,0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,0,0,1,1,0,
%U 0,0,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,0,0,1,1,0,0,0,1,1,0,0,0,0,1
%N Triangle read by rows in which each row contains a finite triangle as shown below.
%C See also A159800, A164002, A167851 and A167852.
%e The main triangle begins:
%e 1,
%e 1,1,1,
%e 1,1,1,1,1,1,
%e 1,1,1,1,0,1,1,1,1,1,
%e 1,1,1,1,0,1,1,0,0,1,1,1,1,1,1,
%e 1,1,1,1,0,1,1,0,0,1,1,0,0,0,1,1,1,1,1,1,1,
%e 1,1,1,1,0,1,1,0,0,1,1,0,0,0,1,1,0,0,0,0,1,1,1,1,1,1,1,1,
%e 1,1,1,1,0,1,1,0,0,1,1,0,0,0,1,1,0,0,0,0,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,1,
%e In which row 1 contains a vertex, only:
%e 1,
%e Row 2 contains the triangle:
%e 1,
%e 1,1,
%e Row 3 contains the triangle:
%e 1,
%e 1,1,
%e 1,1,1,
%e Row 4 contains the triangle:
%e 1,
%e 1,1,
%e 1,0,1,
%e 1,1,1,1,
%e Row 5 contains the triangle:
%e 1,
%e 1,1,
%e 1,0,1,
%e 1,0,0,1,
%e 1,1,1,1,1,
%e Row 6 contains the triangle:
%e 1,
%e 1,1,
%e 1,0,1,
%e 1,0,0,1,
%e 1,0,0,0,1,
%e 1,1,1,1,1,1,
%e Row 7 contains the triangle:
%e 1,
%e 1,1,
%e 1,0,1,
%e 1,0,0,1,
%e 1,0,0,0,1,
%e 1,0,0,0,0,1,
%e 1,1,1,1,1,1,1,
%e Row 8 contains the triangle:
%e 1,
%e 1,1,
%e 1,0,1,
%e 1,0,0,1,
%e 1,0,0,0,1,
%e 1,0,0,0,0,1,
%e 1,0,0,0,0,0,1,
%e 1,1,1,1,1,1,1,1,
%e Row 9 contains the triangle:
%e 1,
%e 1,1,
%e 1,0,1,
%e 1,0,0,1,
%e 1,0,0,0,1,
%e 1,0,0,0,0,1,
%e 1,0,0,0,0,0,1,
%e 1,0,0,0,0,0,0,1,
%e 1,1,1,1,1,1,1,1,1,
%e Row 10 contains the triangle:
%e 1,
%e 1,1,
%e 1,0,1,
%e 1,0,0,1,
%e 1,0,0,0,1,
%e 1,0,0,0,0,1,
%e 1,0,0,0,0,0,1,
%e 1,0,0,0,0,0,0,1,
%e 1,0,0,0,0,0,0,0,1,
%e 1,1,1,1,1,1,1,1,1,1,
%e And so on...
%Y Cf. A159800, A164002, A167851, A167852.
%K easy,nonn,tabf
%O 1,1
%A _Omar E. Pol_, Nov 13 2009