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”).

A223961 as a triangular array

4
1016
208564
35295707256
56805347158641024
8418761231141006486204096
12039063602817689348571440310416384
16574709273459428625759555777663334208165536
220133652171441718057

A223961 as a square array

41020355684120165220
168529580518763906747013365
647073471123113602892734217144
2565864410061768935942861718057
1024486204857142575955
40964031045777663
163843342081
65536
41020355684120165220
168529580518763906747013365
647073471123113602892734217144
2565864410061768935942861718057
1024486204857142575955
40964031045777663
163843342081
65536