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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 32 |
| 4 | 163 |
| 5 | 886 |
| 6 | 5039 |
| 7 | 29616 |
| 8 | 178446 |
| 9 | 1096356 |
| 10 | 6842452 |
| 11 | 43259122 |
| 12 | 276462247 |
| 13 | 1783114592 |
| 14 | 11591769207 |
| 15 | 75874998822 |
| 16 | 499643588823 |
| 17 | 3307746965238 |
| 18 | 22001986381873 |
| 19 | 146972401234478 |
| 20 | 985535271867577 |
| 21 | 6631547191254298 |
| 22 | 44763982636889092 |
| 23 | 303037237861086682 |
[1,2,7,32,163,886,5039,29616,178446,1096356, 6842452,43259122,276462247,1783114592,11591769207, 75874998822,499643588823,3307746965238, 22001986381873,146972401234478,985535271867577, 6631547191254298,44763982636889092, 303037237861086682] |