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”).

A271433 as a simple table

na(n)
10
20
312
4864
541328
62009952
7116220672
88608449792
9850781715456
10114969127987200
1121579927922212864
125686939126548676608
132120212910213354962944

[0,0,12,864,41328,2009952,116220672,8608449792,
 850781715456,114969127987200,21579927922212864,
 5686939126548676608,2120212910213354962944]