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”).

A210927 as a simple table

na(n)
11
25
3172
438444
536567600
6139088906848
72108407726540016
8127364809805575916736
930660305986899859448541568
1029412752846682454724638291977856

[1,5,172,38444,36567600,139088906848,
 2108407726540016,127364809805575916736,
 30660305986899859448541568,
 29412752846682454724638291977856]