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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 32 |
| 5 | 108 |
| 6 | 382 |
| 7 | 1419 |
| 8 | 5437 |
| 9 | 21288 |
| 10 | 84618 |
| 11 | 340499 |
| 12 | 1384711 |
| 13 | 5683834 |
| 14 | 23520471 |
| 15 | 98018975 |
| 16 | 410998473 |
| 17 | 1732666697 |
| 18 | 7339612244 |
| 19 | 31224662178 |
| 20 | 133353750962 |
| 21 | 571527895700 |
| 22 | 2457293364403 |
| 23 | 10596053295516 |
| 24 | 45813536708704 |
| 25 | 198570001079591 |
| 26 | 862624530201300 |
[1,1,3,10,32,108,382,1419,5437,21288,84618,340499, 1384711,5683834,23520471,98018975,410998473, 1732666697,7339612244,31224662178,133353750962, 571527895700,2457293364403,10596053295516, 45813536708704,198570001079591,862624530201300] |