A129102 - 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

A129102 as a simple table

n	a(n)
0	1
1	4
2	20
3	136
4	1360
5	21204
6	537748
7	22891448
8	1675538928
9	214841466180
10	48966357498452
11	20069542925092392
12	14932742187505262032
13	20328765555338724571508
14	50972424276515393704138196

[1,4,20,136,1360,21204,537748,22891448,1675538928, 214841466180,48966357498452,20069542925092392, 14932742187505262032,20328765555338724571508, 50972424276515393704138196]