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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 28 |
| 3 | 599 |
| 4 | 23243 |
| 5 | 1440532 |
| 6 | 131530132 |
| 7 | 16720208200 |
| 8 | 2837752812927 |
| 9 | 622570020892599 |
| 10 | 172077041175850521 |
| 11 | 58679982298020226625 |
| 12 | 24262822372018694983540 |
| 13 | 11986886218243164848742812 |
| 14 | 6987708088810202717378639087 |
| 15 | 4754544525981425409034078100189 |
[1,3,28,599,23243,1440532,131530132,16720208200, 2837752812927,622570020892599,172077041175850521, 58679982298020226625,24262822372018694983540, 11986886218243164848742812, 6987708088810202717378639087, 4754544525981425409034078100189] |