The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 61 |
| 4 | 507 |
| 5 | 1048447 |
| 6 | 134216703 |
| 7 | 1073739775 |
| 8 | 9007199250546687 |
| 9 | 5192296858534827626278696515534847 |
| 10 | 187072209578355573530071658285452771612302071824383 |
[2,6,61,507,1048447,134216703,1073739775, 9007199250546687, 5192296858534827626278696515534847, 18707220957835557353007165828545277161230207182438\ 3] |