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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 23 |
| 8 | 379 |
| 9 | 5706 |
| 10 | 84354 |
| 11 | 1266150 |
| 12 | 19621124 |
| 13 | 316459848 |
| 14 | 5331647951 |
| 15 | 93959680785 |
| 16 | 1732274350449 |
| 17 | 33392773007922 |
| 18 | 672442070185276 |
| 19 | 14130089667648160 |
| 20 | 309458726679280550 |
| 21 | 7054945428667834408 |
| 22 | 167218369471952249237 |
| 23 | 4115763361988379577315 |
| 24 | 105071634182596234984655 |
[1,23,379,5706,84354,1266150,19621124,316459848, 5331647951,93959680785,1732274350449, 33392773007922,672442070185276,14130089667648160, 309458726679280550,7054945428667834408, 167218369471952249237,4115763361988379577315, 105071634182596234984655] |