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”).

A170039 as a simple table

na(n)
01
130
2870
325230
4731670
521218430
6615334470
717844699630
8517496289270
915007392388830
10435214379276070
1112621216999006030
12366015292971174870
1310614443496164071230
14307818861388758065670
158926746980273983904430

[1,30,870,25230,731670,21218430,615334470,
 17844699630,517496289270,15007392388830,
 435214379276070,12621216999006030,
 366015292971174870,10614443496164071230,
 307818861388758065670,8926746980273983904430]