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 A081350 #13 Jun 18 2017 02:18:45 %S A081350 1,2,3,4,15,16,35,36,63,64,99,100,143,144,195,196,255,256,323,324,399, %T A081350 400,483,484,575,576,675,676,783,784,899,900,1023,1024,1155,1156,1295, %U A081350 1296,1443,1444,1599,1600,1763,1764,1935,1936,2115,2116,2303,2304,2499 %N A081350 First column in maze array of natural numbers A081349. %C A081350 Interleaves A000466 with even squares A016742. %H A081350 Vincenzo Librandi, <a href="/A081350/b081350.txt">Table of n, a(n) for n = 0..10000</a> %H A081350 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (1,2,-2,-1,1). %F A081350 a(0)=1, a(1)=2, a(n)=(n-1)*(n+(-1)^n), n>1. %F A081350 G.f.: -(2*x^6-10*x^4+x^3+x^2-x-1)/((1-x)^3*(1+x)^2). [_Colin Barker_, Sep 03 2012] %Y A081350 Cf. A081351, A081352. %K A081350 nonn,easy %O A081350 0,2 %A A081350 _Paul Barry_, Mar 19 2003