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”).

A089198 as a triangular array

1
01
001
0011
00011
000111
0001111
00002111
000012111
0000022111
00000222111
000000322111
0000003322111

A089198 as a square array

1000000000000
100000000000
11000000000
1111000000
111210000
11122200
1112233
111223
11122
1112
111
11
1
1000000000000
100000000000
11000000000
1111000000
111210000
11122200
1112233
111223
11122
1112
111
11
1