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 A249439 #8 Nov 04 2014 16:37:39
%S A249439 0,1,3,5,7,8,21,24,32,36,40,45,48,64,91,94
%N A249439 Record values in A249442.
%F A249439 a(n) = A249442(A249440(n)).
%o A249439 (PARI)
%o A249439 A249442(n) = { for(k=0,n\2,if(0==moebius(binomial(n,k)),return(k))); return(0); }
%o A249439 prevmax = -1; i = 0; for(n=0, 123456789, if((k=A249442(n)) > prevmax, prevmax = k; i++; write("b249439.txt", i, " ", k); write("b249440.txt", i, " ", n)));
%o A249439 \\ Compute both A249439 and A249440 at the same time. - _Antti Karttunen_, Nov 04 2014
%Y A249439 A249440 gives the positions where these values occur in A249442 for the first time.
%K A249439 nonn,more
%O A249439 1,3
%A A249439 _Antti Karttunen_ and _Vladimir Shevelev_, Nov 04 2014