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”).

A307090 as a triangular array

1
11
111
1111
11011
11-2-211
11-5-8-511
11-9-17-17-911
11-14-29-34-29-1411
11-20-44-54-54-44-2011
11-27-62-74-74-74-62-2711
11-35-83-90-74-74-90-83-3511

A307090 as a square array

111111111111
11111111111
110-2-5-9-14-20-27-35
11-2-8-17-29-44-62-83
11-5-17-34-54-74-90
11-9-29-54-74-74
11-14-44-74-74
11-20-62-90
11-27-83
11-35
11
1
111111111111
11111111111
110-2-5-9-14-20-27-35
11-2-8-17-29-44-62-83
11-5-17-34-54-74-90
11-9-29-54-74-74
11-14-44-74-74
11-20-62-90
11-27-83
11-35
11
1