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”).

A131897 as a triangular array

1
32
623
11424
208425
37168426
7032168427
1356432168428
2641286432168429
52125612864321684210

A131897 as a square array

13611203770135264521
2248163264128256
3248163264128
4248163264
52481632
624816
7248
824
92
10
13611203770135264521
2248163264128256
3248163264128
4248163264
52481632
624816
7248
824
92
10