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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 59 |
| 5 | 676 |
| 6 | 13782 |
| 7 | 525624 |
| 8 | 39289875 |
| 9 | 5306323852 |
| 10 | 1456575517928 |
| 11 | 728976500267566 |
| 12 | 736763475137343458 |
| 13 | 1399734009767581939400 |
| 14 | 5252418655426943548516230 |
| 15 | 38299695673374257212534923730 |
[1,3,10,59,676,13782,525624,39289875,5306323852, 1456575517928,728976500267566,736763475137343458, 1399734009767581939400,5252418655426943548516230, 38299695673374257212534923730] |