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”).

A157400 as a triangular array

1
12
166
1242424
180180120120
133012001080720720
11302777010920756050405040
159365745610248087360604804032040320
1267844389849707041103760786240544320362880362880

A157400 as a square array

111111111
2624803301302593626784
6241801200777057456438984
24120108010920102480970704
1207207560873601103760
720504060480786240
504040320544320
40320362880
362880
111111111
2624803301302593626784
6241801200777057456438984
24120108010920102480970704
1207207560873601103760
720504060480786240
504040320544320
40320362880
362880