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 A205405 #5 Mar 30 2012 18:58:11 %S A205405 1,2,1,2,1,6,2,1,2,2,1,4,12,2,1,4,2,2,1,16,4,20,2,1,6,4,9,2,1,6,25,4, %T A205405 9,2,1,6,12,4,25,2,1,30,6,12,4,64,2,1,2,6,30,4,4,2,1,16,64,6,110,4,20, %U A205405 2,1,36,16,6,9,4,12,2,1,9,36,16,6,56,4,12,2,1 %N A205405 s(A205403), where s(j)=floor[(j+1)^2/2]. %C A205405 For a guide to related sequences, see A204892. %t A205405 (See the program at A205402.) %Y A205405 Cf. A205402, A204892. %K A205405 nonn %O A205405 1,2 %A A205405 _Clark Kimberling_, Jan 27 2012