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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 684 |
| 2 | 85994 |
| 3 | 4273404 |
| 4 | 116026274 |
| 5 | 2027079068 |
| 6 | 25196791594 |
| 7 | 238624779404 |
| 8 | 1809372802690 |
| 9 | 11403044613580 |
| 10 | 61485064811946 |
| 11 | 290211246274908 |
| 12 | 1221345936623778 |
| 13 | 4652033922018108 |
| 14 | 16236035536984938 |
| 15 | 52457090694605676 |
| 16 | 158254386445531650 |
| 17 | 449057275178708460 |
[1,684,85994,4273404,116026274,2027079068, 25196791594,238624779404,1809372802690, 11403044613580,61485064811946,290211246274908, 1221345936623778,4652033922018108, 16236035536984938,52457090694605676, 158254386445531650,449057275178708460] |