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%I #3 Sep 08 2013 13:31:32
%S 1,1,1,1,1,1,1,1,1,1,2,1,1,2,1,1,2,1,1,3,3,1,1,3,3,1,1,3,3,1,1,4,6,4,
%T 1,1,4,6,4,1,1,4,6,4,1,1,5,10,10,5,1,1,5,10,10,5,1,1,5,10,10,5,1,1,6,
%U 15,20,15,6,1,1,6,15,20,15,6,1,1,6,15,20,15,6,1,1,7,21,35,35,21,7,1,1,7,21
%N Triangle read by rows, A007318 rows repeated three times .
%C Diagonal sums : A079398 . Lengths of row are : 1,1,1,2,2,2,3,3,3,4,4,4,5,5,5,... (A008620) .
%e Triangle begins : 1 ; 1 ; 1 ; 1,1 ; 1,1 ; 1,1 ; 1,2,1 ; 1,2,1 ; 1,2,1 ; 1,3,3,1 ; 1,3,3,1 ; 1,3,3,1 ; 1,4,6,4,1 ; ...
%Y Cf. A007318, A152198, A152815
%K easy,nonn,tabf
%O 0,11
%A _Philippe Deléham_, Dec 13 2008
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