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”).

A287020 as a triangular array

1
11
116
11461926
1126489254415767640
1306312394371029332013762061379857600
1909240019299420057718615046416058241106578005363188066566330000
13181051140102664454761181295891072001340797019145183600

A287020 as a square array

11111111
111123090318
6466486312924001051140
192692544394371019299420010266445476
157676402933201376577186150464118129589107200
206137985760016058241106578001340797019145183600
5363188066566330000
11111111
111123090318
6466486312924001051140
192692544394371019299420010266445476
157676402933201376577186150464118129589107200
206137985760016058241106578001340797019145183600
5363188066566330000