| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 130 |
| 4 | 2075 |
| 5 | 44196 |
| 6 | 1183492 |
| 7 | 38254712 |
| 8 | 1449394470 |
| 9 | 62974889140 |
| 10 | 3085705347128 |
| 11 | 168283580164356 |
| 12 | 10107641429213386 |
| 13 | 662869582493716400 |
| 14 | 47124829795282593000 |
| 15 | 3609674673146922124600 |
| 16 | 296355186635275737517175 |
[1,2,12,130,2075,44196,1183492,38254712, 1449394470,62974889140,3085705347128, 168283580164356,10107641429213386, 662869582493716400,47124829795282593000, 3609674673146922124600,296355186635275737517175] |