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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 234 |
| 3 | 10428 |
| 4 | 492522 |
| 5 | 24033006 |
| 6 | 1197423396 |
| 7 | 60530725380 |
| 8 | 3092592004074 |
| 9 | 159295600885794 |
| 10 | 8258018380659234 |
| 11 | 430335300869496072 |
| 12 | 22521831447746893092 |
| 13 | 1182951246247357578348 |
| 14 | 62325193477833011143260 |
| 15 | 3292376206935392483917428 |
| 16 | 174323297281680647978503146 |
| 17 | 9248680725006429075147528150 |
[1,6,234,10428,492522,24033006,1197423396, 60530725380,3092592004074,159295600885794, 8258018380659234,430335300869496072, 22521831447746893092,1182951246247357578348, 62325193477833011143260,3292376206935392483917428, 174323297281680647978503146, 9248680725006429075147528150] |