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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 150 |
| 4 | 15791 |
| 5 | 5442547 |
| 6 | 4762077620 |
| 7 | 8738543204786 |
| 8 | 29476338150380267 |
| 9 | 166824392081434701613 |
| 10 | 1483193888081012069795493 |
| 11 | 19709785177023094680286421698 |
| 12 | 376477754511485610186131980496220 |
| 13 | 10014420201202866850432679446597128835 |
[1,1,6,150,15791,5442547,4762077620,8738543204786, 29476338150380267,166824392081434701613, 1483193888081012069795493, 19709785177023094680286421698, 376477754511485610186131980496220, 10014420201202866850432679446597128835] |