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 A191747 #17 Aug 03 2014 14:29:48
%S A191747 1,1,0,0,1,1,0,0,0,1,0,0,0,1,1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1,1,0,0,0,
%T A191747 0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,1,0,0,0,0,0,0,1,0,0,0,0,0,
%U A191747 0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,1
%N A191747 Concatenation of row entries of the n X n identity matrices.
%C A191747 The sequence of all n for which a(n)=1 is A191748 = {1,2,5,6,10,14,...}.
%t A191747 Flatten[Table[Array[KroneckerDelta, {n, n}], {n, 1, 6}]] (* _Geoffrey Critzer_, Dec 11 2011 *)
%o A191747 (PARI) for(n=1,9,for(a=1,n,for(b=1,n,print1(a==b", ")))) \\ _Charles R Greathouse IV_, Jun 29 2011
%K A191747 nonn,easy
%O A191747 1,1
%A A191747 _L. Edson Jeffery_, Jun 27 2011