A222478 - 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

A222478 as a simple table

n	a(n)
1	17
2	139
3	2953
4	267772
5	4927416
6	544804117
7	17557049164
8	3344195404943
9	145842478973059
10	43014763466911784
11	2152016451274069352
12	684473548396481784093
13	34905249009694803928802

[17,139,2953,267772,4927416,544804117,17557049164, 3344195404943,145842478973059,43014763466911784, 2152016451274069352,684473548396481784093, 34905249009694803928802]