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%I #4 Mar 30 2012 17:34:03
%S 1,1,4,1,2,3,7,1,2,3,4,5,10,1,2,3,4,5,6,7,13,1,2,3,4,5,6,7,8,9,16,1,2,
%T 3,4,5,6,7,8,9,10,11,19,1,2,3,4,5,6,7,8,9,10,11,12,13,22,1,2,3,4,5,6,
%U 7,8,9,10,11,12,13,14,15,25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,28,1
%N Triangle read by rows in which row n lists 3n-2 together with the first 2n-1 positive integers.
%e Triangle begins:
%e 1,1,
%e 4,1,2,3,
%e 7,1,2,3,4,5,
%e 10,1,2,3,4,5,6,7,
%e 13,1,2,3,4,5,6,7,8,9,
%e 16,1,2,3,4,5,6,7,8,9,10,11,
%e 19,1,2,3,4,5,6,7,8,9,10,11,12,13,
%e 22,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
%e 25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,
%Y Cf. A016777, A172310, A171173, A171174, A171175, A171176, A171177, A171178.
%K easy,nonn,tabf
%O 1,3
%A _Omar E. Pol_, Feb 23 2010
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