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 A114827 #6 Jun 23 2014 19:22:26 %S A114827 648,342,240,16,806,117,648,823,542,576,480,40,353,606,282,475,248, %T A114827 197,732,674,213,841,287,200,968,890,104,66,782,230,728,484,747,561, %U A114827 509,942,332,329,305,696,2,326,305,139,872,61,628,413,597,910,448,113,988 %N A114827 The numbers 7^n-1 written in groups of three digits, with leading zeros omitted. %e A114827 6, 48, 342, 2400, 16806, 117648, ... %Y A114827 Cf. A114645. %K A114827 base,dumb,nonn %O A114827 1,1 %A A114827 _Jonathan Vos Post_, Feb 19 2006 %E A114827 Terms recomputed to use the definition equivalent to A114645 by _Alois P. Heinz_, Jun 23 2014