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 A027828 #13 Jul 02 2025 16:01:55
%S A027828 1,1,1,1,1,1,1,1,1,2,11,11,11,11,11,11,11,11,12,111,111,111,111,111,
%T A027828 111,111,111,112,1111,1111,1111,1111,1111,1111,1111,1111,1112,11111,
%U A027828 11111,11111,11111,11111,11111,11111,11111,11112,111111,111111,111111
%N A027828 First differences of A010785.
%H A027828 <a href="/index/Rec#order_17">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-1,-1,-1,-1,-1,-1,-1,10,10,10,10,10,10,10,10,10).
%t A027828 Differences[Union[FromDigits/@Flatten[Table[PadRight[{},i,n],{n,0,9},{i,6}],1]]] (* _Harvey P. Dale_, Jan 16 2013 *)
%Y A027828 Cf. A010785.
%K A027828 nonn,base
%O A027828 0,10
%A A027828 Jean-Marc MALASOMA (Malasoma(AT)entpe.fr)
%E A027828 More terms from _James Sellers_, May 01 2000