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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 2 |
| 5 | 8 |
| 6 | 16 |
| 7 | 52 |
| 8 | 134 |
| 9 | 432 |
| 10 | 1248 |
| 11 | 4104 |
| 12 | 12648 |
| 13 | 42464 |
| 14 | 136512 |
| 15 | 466568 |
| 16 | 1545566 |
| 17 | 5361632 |
| 18 | 18165184 |
| 19 | 63804952 |
| 20 | 219997832 |
| 21 | 780895392 |
| 22 | 2730730176 |
| 23 | 9780049008 |
| 24 | 34598622616 |
| 25 | 124873507904 |
| 26 | 446068180608 |
| 27 | 1620786592416 |
| 28 | 5837657948832 |
| 29 | 21336295622016 |
| 30 | 77395590570240 |
[1,1,2,2,2,8,16,52,134,432,1248,4104,12648,42464, 136512,466568,1545566,5361632,18165184,63804952, 219997832,780895392,2730730176,9780049008, 34598622616,124873507904,446068180608, 1620786592416,5837657948832,21336295622016, 77395590570240] |