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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 877 |
| 3 | 433252 |
| 4 | 656404264 |
| 5 | 2227156082842 |
| 6 | 14216420563705724 |
| 7 | 152834703739876070716 |
| 8 | 2562708954761302163168116 |
| 9 | 63338792205478132108785337770 |
| 10 | 2209363673047740561377241754826088 |
| 11 | 105080298194482216982100203776114994146 |
| 12 | 6626004995903793205763315247117544349120572 |
[1,15,877,433252,656404264,2227156082842, 14216420563705724,152834703739876070716, 2562708954761302163168116, 63338792205478132108785337770, 2209363673047740561377241754826088, 105080298194482216982100203776114994146, 6626004995903793205763315247117544349120572] |