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 A161358 #5 Mar 31 2012 12:35:30 %S A161358 1,1,2,2,3,3,3,3,3,4,3,4,5,4,5,4,5,5,5,5,6,5,5,6,7,6,6,7,6,6,7,7,6,7, %T A161358 7,8,7,7,7,8,9,7,8,8,9,7,8,8,9,9,8,8,7,9,10,8,9,9,9,10,11,9,9,10,10, %U A161358 11,9,9,10,10,11,11,10,10,10,11,11,12,10,10,9,11,11,12,13,9,11,11,12,12,13,11,11,11,12,12 %N A161358 Shorter side (x) of inner rectangle described in A168339. %Y A161358 Cf. A161357, A168339. Equals A145288(n)-2. %K A161358 nonn %O A161358 1,3 %A A161358 _R. H. Hardin_ and _N. J. A. Sloane_, Nov 27 2009 %E A161358 Corrected definition and flipped sign in the formula - _R. J. Mathar_, Mar 06 2010