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 A083279 #10 Mar 11 2015 11:01:35 %S A083279 1,1,2,3,2,1,1,2,2,1,1,1,1,2,2,1,1,2,1,1,1,5,2,1,1,7,1,1,5,2,2,1,1,1, %T A083279 2,1,1,1,1,2,1,2,4,1,2,1,6,1,1,5,2,1,2,1,1,1,2,2,1,2,4,3,2,3,3,1,4,1, %U A083279 1,2,1,1,1,1,2,1,3,1,1,1,3,1,1,1,1,1,1,8,1,1,1,1,5 %N A083279 Length of odd/even runs in A061419, where a(2n)=length of n-th run of even numbers in A061419 and a(2n-1)=length of n-th run of odd numbers. %C A083279 Parity of A061419(n) can be fully reconstructed from this sequence. %o A083279 (PARI) p=1; c=0; r=0; for(n=1, 1000, p=p+ceil(p/2); if(p%2==r, c=c+1, print1(c", "); r=!r; c=1)) %K A083279 nonn,easy %O A083279 1,3 %A A083279 _Ralf Stephan_, Jun 02 2003