A205978 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

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”).

Other ways to Give

A205978 as a simple table

n	a(n)
1	81
2	1980
3	27060
4	419088
5	9653376
6	338009472
7	19410499584
8	1690931386368
9	230418338273280
10	52219993101631488
11	18073632573916545024
12	9818099537300641382400
13	8885510832166696098201600

[81,1980,27060,419088,9653376,338009472, 19410499584,1690931386368,230418338273280, 52219993101631488,18073632573916545024, 9818099537300641382400,8885510832166696098201600]