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 A116468 #12 Dec 02 2016 14:32:52 %S A116468 2,3,1,6,4,7,5,10,8,11,9,14,12,15,13,18,16,19,17,22,20,23,21,26,24,27, %T A116468 25,30,28,31,29,34,32,35,33,38,36,39,37,42,40,43,41,46,44,47,45,50,48, %U A116468 51,49,54,52,55,53,58,56,59,57,62,60,63,61,66,64,67 %N A116468 Permutation of natural numbers generated by 2-rowed array shown below. %C A116468 2 3 6 7 10 11 14 15 ... integers congruent to 2 or 3 mod 4 %C A116468 1 4 5 8 9 12 13 16 ... integers congruent to 0 or 1 mod 4 %D A116468 M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988 %D A116468 Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997 %H A116468 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,0,1,-1). %F A116468 For n>2, a(n+4k) = a(n) + 4k, with k>=1. %F A116468 G.f.: x*(2+x-2*x^2+5*x^3-4*x^4+2*x^5)/(1-x-x^4+x^5). - _Philippe Deléham_, Dec 02 2016 %Y A116468 Cf. A090964. %K A116468 easy,nonn %O A116468 1,1 %A A116468 _Giovanni Teofilatto_, Mar 17 2006 %E A116468 Terms corrected by _R. J. Mathar_, Oct 25 2011