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 A186274 #6 Mar 30 2012 18:57:18 %S A186274 2,5,9,12,15,19,22,26,29,33,36,40,43,46,50,53,57,60,64,67,71,74,78,81, %T A186274 84,88,91,95,98,102,105,109,112,115,119,122,126,129,133,136,140,143, %U A186274 147,150,153,157,160,164,167,171,174,178,181,184,188,191,195,198,202,205,209,212,216,219,222,226,229,233,236,240,243,247,250,253,257,260,264,267,271,274,278,281,284,288,291,295,298,302,305,309,312,316,319,322,326,329,333,336,340,343 %N A186274 Adjusted joint rank sequence of (f(i)) and (g(j)) with f(i) before g(j) when f(i)=g(j), where f and g are the triangular numbers and octagonal numbers. Complement of A186159. %C A186274 See A186159. %e A186274 First, write the triangular and octagonal numbers: %e A186274 1..3..6.....10..15..21..28 %e A186274 1........8..........21...... %e A186274 Then replace each by its rank, where ties are settled by ranking the triangular number before the octagonal: %e A186274 a=(1,3,4,6,7,8,10,11,13,...)=A186159. %e A186274 b=(2,5,9,12,15,19,22,26,...)=A186274. %t A186274 (See A186159.) %Y A186274 Cf. A186159, A186219. %K A186274 nonn %O A186274 1,1 %A A186274 _Clark Kimberling_, Feb 16 2011