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 A114882 #2 Mar 30 2012 18:57:06 %S A114882 1,3,2,5,4,7,6,8,10,9,12,11,16,24,18,13,22,15,28,48,30,17,36,14,40,120 %N A114882 Transposition sequence of A114881. %C A114882 A self-inverse permutation of the natural numbers. %F A114882 (See A114538 for definition of transposition sequence.) %e A114882 Start with the northwest corner of A114881: %e A114882 1 3 5 7 9 %e A114882 2 8 14 20 26 %e A114882 4 24 34 54 64 %e A114882 6 48 76 90 118 %e A114882 a(1)=1 because 1=T(1,1) and T(1,1)=1. %e A114882 a(2)=3 because 2=T(2,1) and T(1,2)=3. %e A114882 a(3)=2 because 3=T(1,2) and T(2,1)=2. %e A114882 a(20)=48 because 20=T(2,4) and T(4,2)=48. %Y A114882 Cf. A083140, A114881. %K A114882 nonn %O A114882 1,2 %A A114882 _Clark Kimberling_, Jan 03 2006