| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 145 |
| 5 | 2111 |
| 6 | 47624 |
| 7 | 1626003 |
| 8 | 82564031 |
| 9 | 6146805142 |
| 10 | 662718022355 |
| 11 | 102336213875523 |
| 12 | 22408881211102698 |
| 13 | 6895949927379360277 |
| 14 | 2958271314760111914191 |
| 15 | 1756322140048351303019576 |
[1,1,3,16,145,2111,47624,1626003,82564031, 6146805142,662718022355,102336213875523, 22408881211102698,6895949927379360277, 2958271314760111914191,1756322140048351303019576] |