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”).

A179661 as a triangular array

1
22
366
4121212
520606060
63060606060
742210420420420420
856280840840840840840
972504252025202520252025202520
10906302520252025202520252025202520
11110990

A179661 as a square array

1234567891011
2612203042567290110
6126060210280504630990
12606042084025202520
606042084025202520
6042084025202520
42084025202520
84025202520
25202520
2520
1234567891011
2612203042567290110
6126060210280504630990
12606042084025202520
606042084025202520
6042084025202520
42084025202520
84025202520
25202520
2520