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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 42 |
| 4 | 236 |
| 5 | 1420 |
| 6 | 8976 |
| 7 | 58644 |
| 8 | 393200 |
| 9 | 2689522 |
| 10 | 18694164 |
| 11 | 131658910 |
| 12 | 937490780 |
| 13 | 6737990172 |
| 14 | 48816739048 |
| 15 | 356142597586 |
| 16 | 2614103310384 |
| 17 | 19291118713324 |
| 18 | 143044431901580 |
| 19 | 1065237986700788 |
| 20 | 7963426677825000 |
| 21 | 59741019702076168 |
| 22 | 449601401992383464 |
| 23 | 3393484429948103486 |
[1,2,8,42,236,1420,8976,58644,393200,2689522, 18694164,131658910,937490780,6737990172, 48816739048,356142597586,2614103310384, 19291118713324,143044431901580,1065237986700788, 7963426677825000,59741019702076168, 449601401992383464,3393484429948103486] |