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”).

A181005 as a simple table

na(n)
10
20
31
42
561
63686
7652374
8338047350
9527266113211
102545622222227666

[0,0,1,2,61,3686,652374,338047350,527266113211,
 2545622222227666]