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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 85 |
| 5 | 645 |
| 6 | 5878 |
| 7 | 62495 |
| 8 | 759351 |
| 9 | 10379878 |
| 10 | 157652085 |
| 11 | 2633903669 |
| 12 | 48005235886 |
| 13 | 947849607015 |
| 14 | 20154635314591 |
| 15 | 459170181891230 |
| 16 | 11158379672316837 |
| 17 | 288109467764819749 |
| 18 | 7876576756719778854 |
| 19 | 227299554620022188879 |
| 20 | 6904560742996004248135 |
[1,1,3,14,85,645,5878,62495,759351,10379878, 157652085,2633903669,48005235886,947849607015, 20154635314591,459170181891230,11158379672316837, 288109467764819749,7876576756719778854, 227299554620022188879,6904560742996004248135] |