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”).

A216915 as a triangular array

1
11
111
1111
21111
211111
12121111
121211111
4812121111
144121211111
144038112121111
1440381121211111
17280380

A216915 as a square array

1111221212481441440144017280
111111111333
111122228880
111111111
1111221212
1111111
111122
11111
1111
111
11
1
1111221212481441440144017280
111111111333
111122228880
111111111
1111221212
1111111
111122
11111
1111
111
11
1