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”).

A198789 as a triangular array

1
12
113
1234
11215
122136
1112457
12121178
113325419
12324127310
112344661511
1223153314712
11142351857913

A198789 as a square array

1111111111111
212121212121
33221133221
4112232334
534124412
65151453
7742635
817631
93118
10545
1177
129
13
1111111111111
212121212121
33221133221
4112232334
534124412
65151453
7742635
817631
93118
10545
1177
129
13