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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 48 |
| 4 | 693 |
| 5 | 26632 |
| 6 | 2542514 |
| 7 | 533442978 |
| 8 | 278979307990 |
| 9 | 343728261289376 |
| 10 | 904762216681139381 |
| 11 | 5771110378770242683658 |
| 12 | 88742047516327429085056353 |
| 13 | 2912737209806573079629325613400 |
| 14 | 224604736339682169442980060945290802 |
[1,2,7,48,693,26632,2542514,533442978, 278979307990,343728261289376,904762216681139381, 5771110378770242683658,88742047516327429085056353, 2912737209806573079629325613400, 224604736339682169442980060945290802] |