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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 67 |
| 5 | 343 |
| 6 | 2151 |
| 7 | 14900 |
| 8 | 78939 |
| 9 | 470880 |
| 10 | 2805054 |
| 11 | 17296396 |
| 12 | 110869750 |
| 13 | 716116412 |
| 14 | 4868928433 |
| 15 | 30169477167 |
| 16 | 196213489166 |
| 17 | 1272224938490 |
| 18 | 8371053970724 |
| 19 | 55530391931787 |
| 20 | 369148740629927 |
| 21 | 2514270810574079 |
| 22 | 16452249276575722 |
| 23 | 109991261928916853 |
[1,1,4,14,67,343,2151,14900,78939,470880,2805054, 17296396,110869750,716116412,4868928433, 30169477167,196213489166,1272224938490, 8371053970724,55530391931787,369148740629927, 2514270810574079,16452249276575722, 109991261928916853] |