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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 57 |
| 4 | 966 |
| 5 | 31801 |
| 6 | 2065350 |
| 7 | 266370105 |
| 8 | 68453106630 |
| 9 | 35115918982201 |
| 10 | 35993681099981766 |
| 11 | 73750982613738224697 |
| 12 | 302157703921043555451846 |
| 13 | 2475577920866839506242796601 |
| 14 | 40562343629382474008388259775430 |
| 15 | 1329187433441286490429798672020569145 |
[1,6,57,966,31801,2065350,266370105,68453106630, 35115918982201,35993681099981766, 73750982613738224697,302157703921043555451846, 2475577920866839506242796601, 40562343629382474008388259775430, 1329187433441286490429798672020569145] |