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”).

A208201 as a triangular array

1
22
5145
1517817815
51265310366265351
1874127263970163970141272187
7156485693972505415661748039725054648569715
279510215440246850466538372808893383728088932468504665102154402795

A208201 as a square array

12515511877152795
21417826534127264856910215440
517810366639701397250542468504665
15265363970115661748038372808893
51412723972505438372808893
1876485692468504665
71510215440
2795
12515511877152795
21417826534127264856910215440
517810366639701397250542468504665
15265363970115661748038372808893
51412723972505438372808893
1876485692468504665
71510215440
2795