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A162621 Triangle read by rows in which row n lists n consecutive natural numbers A000027, starting with A014689(n+1) = A000040(n+1)-n-1.

%I A162621 #2 Mar 30 2012 17:34:01
%S A162621 1,2,3,3,4,5,6,7,8,9,7,8,9,10,11,10,11,12,13,14,15,11,12,13,14,15,16,
%T A162621 17,14,15,16,17,18,19,20,21,19,20,21,22,23,24,25,26,27,20,21,22,23,24,
%U A162621 25,26,27,28,29,25,26,27,28,29,30,31,32,33,33,34,35,28,29,30,31,32,33,34
%N A162621 Triangle read by rows in which row n lists n consecutive natural numbers A000027, starting with A014689(n+1) = A000040(n+1)-n-1.
%C A162621 Note that the last term of the n-th row is A000040(n+1)-2 = A040976(n+1).
%C A162621 See also A162618, A162619 and A162620.
%e A162621 Triangle begins:
%e A162621 .1;
%e A162621 .2, 3;
%e A162621 .3, 4, 5;
%e A162621 .6, 7, 8, 9;
%e A162621 .7, 8, 9,10,11;
%e A162621 10,11,12,13,14,15;
%e A162621 11,12,13,14,15,16,17;
%e A162621 14,15,16,17,18,19,20,21;
%e A162621 19,20,21,22,23,24,25,26,27;
%e A162621 20,21,22,23,24,25,26,27,28,29;
%Y A162621 Cf. A000040, A014689, A040976, A159797, A159798, A162611, A162618, A162619, A162620.
%K A162621 easy,nonn,tabl
%O A162621 1,2
%A A162621 _Omar E. Pol_, Jul 10 2009