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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 108 |
| 4 | 2200 |
| 5 | 61708 |
| 6 | 2249268 |
| 7 | 102377404 |
| 8 | 5651999688 |
| 9 | 370171228504 |
| 10 | 28262385542832 |
| 11 | 2480108374814480 |
| 12 | 247231765611893504 |
| 13 | 27722619251007202720 |
| 14 | 3467475213036160205984 |
| 15 | 480277499859342401636704 |
| 16 | 73202023124111697153718080 |
| 17 | 12209186681659842887207280448 |
[1,1,8,108,2200,61708,2249268,102377404, 5651999688,370171228504,28262385542832, 2480108374814480,247231765611893504, 27722619251007202720,3467475213036160205984, 480277499859342401636704, 73202023124111697153718080, 12209186681659842887207280448] |