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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 43 |
| 4 | 386 |
| 5 | 9451 |
| 6 | 246961 |
| 7 | 6031627 |
| 8 | 212559508 |
| 9 | 6571985126 |
| 10 | 243940325734 |
| 11 | 9140730357409 |
| 12 | 352312505157354 |
| 13 | 14801600281919487 |
| 14 | 600054439936968241 |
| 15 | 26927918031565051915 |
| 16 | 1149140935414286560040 |
| 17 | 53804800109969394477580 |
| 18 | 2401141625752684697505820 |
[1,1,1,43,386,9451,246961,6031627,212559508, 6571985126,243940325734,9140730357409, 352312505157354,14801600281919487, 600054439936968241,26927918031565051915, 1149140935414286560040,53804800109969394477580, 2401141625752684697505820] |