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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 189 |
| 5 | 2671 |
| 6 | 50253 |
| 7 | 1203679 |
| 8 | 35548509 |
| 9 | 1263153631 |
| 10 | 52973381853 |
| 11 | 2581493517439 |
| 12 | 144317666200029 |
| 13 | 9156299509121311 |
| 14 | 653254398215833053 |
| 15 | 51995430120141924799 |
| 16 | 4585316010326597014749 |
| 17 | 445304380297565009962591 |
| 18 | 47368550666889620425580253 |
| 19 | 5492643630110295899167573759 |
[1,1,3,19,189,2671,50253,1203679,35548509, 1263153631,52973381853,2581493517439, 144317666200029,9156299509121311, 653254398215833053,51995430120141924799, 4585316010326597014749,445304380297565009962591, 47368550666889620425580253, 5492643630110295899167573759] |