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 A120697 #2 Mar 31 2012 13:21:32
%S A120697 0,1,4,5,21,22,25,26,27,156,157,161,162,163,181,182,183,186,187,188,
%T A120697 191,192,193,194,781,782,786,787,788,806,807,808,811,812,813,816,817,
%U A120697 818,819,906,907,908,911,912,913,916,917,918,919,931,932,933,936,937,938
%N A120697 Set partitions interpreted as base m+1 numbers, where m is the size of the set.
%e A120697 Set partition number 3 is {1,2}, 12 in base 3 is 5, so a(3) = 5.
%Y A120697 Cf. A000110 (row lengths), A120698, A120695.
%K A120697 base,nonn,tabf
%O A120697 0,3
%A A120697 _Franklin T. Adams-Watters_, Jun 28 2006