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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 30 |
| 5 | 133 |
| 6 | 768 |
| 7 | 5221 |
| 8 | 41302 |
| 9 | 369170 |
| 10 | 3677058 |
| 11 | 40338310 |
| 12 | 483134179 |
| 13 | 6271796072 |
| 14 | 87709287104 |
| 15 | 1314511438945 |
| 16 | 21017751750506 |
| 17 | 357102350816602 |
| 18 | 6424883282375340 |
| 19 | 122025874117476166 |
| 20 | 2439726373093186274 |
| 21 | 51220112287152570828 |
| 22 | 1126575412217509969515 |
[1,1,3,8,30,133,768,5221,41302,369170,3677058, 40338310,483134179,6271796072,87709287104, 1314511438945,21017751750506,357102350816602, 6424883282375340,122025874117476166, 2439726373093186274,51220112287152570828, 1126575412217509969515] |