login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A050205 as a triangular array

1
12
112
1223
11122
123233
1121223
12122233
112212233
1222323444
11112122223
123333233334
1122231223334
12121232223

A050205 as a square array

11111111111111
2121212121212
221321221321
32212221322
2322132321
322221332
33232213
3342322
342322
42332
3333
43
4
11111111111111
2121212121212
221321221321
32212221322
2322132321
322221332
33232213
3342322
342322
42332
3333
43
4