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 A122403 #2 Mar 31 2012 13:23:38 %S A122403 1,0,3,4,5,9,6,12,7,15,16,27,8,18,20,36,9,21,24,45,25,48,81,10,24,28, %T A122403 54,30,60,108,64,11,27,32,63,35,72,135,80,36,75,144,243,12,30,36,72, %U A122403 40,84,162,96,42,90,180,324,100,192 %N A122403 Table read by rows: rearrangement of A122401 to illustrate linear column sequences. %e A122403 The row sums and array begin: %e A122403 1 1 %e A122403 0 0 %e A122403 3 3 %e A122403 4 4 %e A122403 14 5 9 %e A122403 18 6 12 %e A122403 65 7 15 16 27 %e A122403 82 8 18 20 36 %e A122403 253 9 21 24 45 25 48 81 %e A122403 378 10 24 28 54 30 60 108 64 %e A122403 953 11 27 32 63 35 72 135 80 36 75 144 243 %e A122403 1460 12 30 36 72 40 84 162 96 42 90 180 324 100 192 %Y A122403 Cf. A122172 A122401 A122402. %K A122403 nonn,tabf %O A122403 0,3 %A A122403 _Alford Arnold_, Sep 03 2006