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”).

A261960 as a triangular array

1
11
112
1114
11138
1113416
11133732
1113351464
1113351123128
111335111539256
11133511132371512
111335111319371241024

A261960 as a square array

111111111111
11111111111
2111111111
433333333
84333333
16755555
321411111111
6423151313
128392319
2567137
512124
1024
111111111111
11111111111
2111111111
433333333
84333333
16755555
321411111111
6423151313
128392319
2567137
512124
1024