login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A209497 as a simple table

na(n)
12
26
357
4690
59393
6133380
71920126
827760512
9401882796
105820335088
1184304518360
121221153876288
1317688664980912
14256224877720896
153711487617186912
1653761934301895680
17778756709322725568

[2,6,57,690,9393,133380,1920126,27760512,
 401882796,5820335088,84304518360,1221153876288,
 17688664980912,256224877720896,3711487617186912,
 53761934301895680,778756709322725568]