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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 33 |
| 4 | 517 |
| 5 | 15326 |
| 6 | 852912 |
| 7 | 91023697 |
| 8 | 19716262702 |
| 9 | 8794395041567 |
| 10 | 8016790849841585 |
| 11 | 15556074485786226848 |
| 12 | 64891787190080888991273 |
| 13 | 561815453349204340865790817 |
| 14 | 10402242033224422585780623039909 |
| 15 | 423787530114579490372987256671625678 |
[1,1,4,33,517,15326,852912,91023697,19716262702, 8794395041567,8016790849841585, 15556074485786226848,64891787190080888991273, 561815453349204340865790817, 10402242033224422585780623039909, 423787530114579490372987256671625678] |