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”).

A180237 as a simple table

na(n)
11
212
3960
4337680
5367597440
6755465356800
73208061483827200
823775433137840384000

[1,12,960,337680,367597440,755465356800,
 3208061483827200,23775433137840384000]