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”).

A108886 as a triangular array

1
11
121
1131
11341
115251
11120561
1113535371
1111128781
111196342491
11111542351209101
111112311166555111
1111139623172455511121
11

A108886 as a square array

11111111111111
1211111111111
13351111111
142203511111
15535191511
163286342231396
177423511231
1841206672
1995545
110555
11111
112
1
11111111111111
1211111111111
13351111111
142203511111
15535191511
163286342231396
177423511231
1841206672
1995545
110555
11111
112
1