This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A186388 #4 Mar 30 2012 18:57:18 %S A186388 1,2,4,5,7,9,11,14,16,19,22,25,28,31,35,38,42,46,50,55,59,64,69,74,79, %T A186388 84,90,95,101,107,113,120,126,133,140,147,154,161,169,176,184,192,200, %U A186388 209,217,226,235,244,253,262,272,281,291,301,311,322,332,343,354,365,376,387,399,410,422,434,446,459,471,484,497,510,523,536,550,563,577,591,605,620,634,649,664,679,694,709,725,740,756,772,788,805,821 %N A186388 Adjusted joint rank sequence of (f(i)) and (g(j)) with f(i) before g(j) when f(i)=g(j), where f(i)=6i and g(j)=j(j+1)/2 (triangular number). Complement of A186387. %e A186388 First, write %e A186388 ......6.....12..18....24..30. (6i) %e A186388 1..3..6..10...15....21..28... (triangular) %e A186388 Then replace each number by its rank, where ties are settled by ranking 6i before the triangular: %e A186388 a=(3,6,8,10,12,13,15,17,...)=A186387 %e A186388 b=(1,2,4,5,7,9,11,14,16,...)=A186388. %t A186388 (See A186387.) %Y A186388 Cf. A186350, A186387, A186389, A186390. %K A186388 nonn %O A186388 1,2 %A A186388 _Clark Kimberling_, Feb 19 2011