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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 269 |
| 5 | 4616 |
| 6 | 102847 |
| 7 | 2824816 |
| 8 | 92355769 |
| 9 | 3506278528 |
| 10 | 151720849691 |
| 11 | 7375146930944 |
| 12 | 398113181435653 |
| 13 | 23640909385071616 |
| 14 | 1532325553233566743 |
| 15 | 107698939845869111296 |
| 16 | 8162300091585206125553 |
| 17 | 663836705760309127184384 |
[1,1,3,22,269,4616,102847,2824816,92355769, 3506278528,151720849691,7375146930944, 398113181435653,23640909385071616, 1532325553233566743,107698939845869111296, 8162300091585206125553,663836705760309127184384] |