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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 16 |
| 3 | 102 |
| 4 | 630 |
| 5 | 4690 |
| 6 | 34012 |
| 7 | 287140 |
| 8 | 2364992 |
| 9 | 22028490 |
| 10 | 200930125 |
| 11 | 2026692954 |
| 12 | 20118254688 |
| 13 | 217071252489 |
| 14 | 2316174126448 |
| 15 | 26506083938686 |
| 16 | 301219138880440 |
| 17 | 3632894429145798 |
| 18 | 43657425153387876 |
| 19 | 552138493209771090 |
[2,16,102,630,4690,34012,287140,2364992,22028490, 200930125,2026692954,20118254688,217071252489, 2316174126448,26506083938686,301219138880440, 3632894429145798,43657425153387876, 552138493209771090] |