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”).

A241704 as a simple table

na(n)
10
20
30
40
50
61
73
841
91095
10104829
1121981199
128077770931

[0,0,0,0,0,1,3,41,1095,104829,21981199,8077770931]