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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 20 |
| 2 | 524 |
| 3 | 19660 |
| 4 | 854380 |
| 5 | 40304080 |
| 6 | 2004409236 |
| 7 | 103440770760 |
| 8 | 5486614131756 |
| 9 | 297239307415792 |
| 10 | 16376472734974384 |
| 11 | 914734188877259884 |
| 12 | 51680064605716043636 |
| 13 | 2948046519564292501232 |
| 14 | 169560941932509940657016 |
| 15 | 9822377923336683964009296 |
| 16 | 572554753384166308597716396 |
[1,20,524,19660,854380,40304080,2004409236, 103440770760,5486614131756,297239307415792, 16376472734974384,914734188877259884, 51680064605716043636,2948046519564292501232, 169560941932509940657016, 9822377923336683964009296, 572554753384166308597716396] |