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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 76 |
| 4 | 772 |
| 5 | 9856 |
| 6 | 152099 |
| 7 | 2758931 |
| 8 | 57602672 |
| 9 | 1362342830 |
| 10 | 36046013013 |
| 11 | 1056342305565 |
| 12 | 34002625115587 |
| 13 | 1193660155852584 |
| 14 | 45414253886783716 |
| 15 | 1862232981974586960 |
| 16 | 81893921416048297995 |
| 17 | 3845201559359081046971 |
| 18 | 192006280895048080286802 |
[1,2,10,76,772,9856,152099,2758931,57602672, 1362342830,36046013013,1056342305565, 34002625115587,1193660155852584,45414253886783716, 1862232981974586960,81893921416048297995, 3845201559359081046971,192006280895048080286802] |