| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 27 |
| 5 | 388 |
| 6 | 16436 |
| 7 | 2175432 |
| 8 | 934036488 |
| 9 | 1336005150480 |
| 10 | 6496133192508960 |
| 11 | 109111368146935714560 |
| 12 | 6414259771390908431554560 |
| 13 | 1334245289372299128934618629120 |
| 14 | 991211300949703256415518451506380800 |
[1,2,5,27,388,16436,2175432,934036488, 1336005150480,6496133192508960, 109111368146935714560,6414259771390908431554560, 1334245289372299128934618629120, 991211300949703256415518451506380800] |