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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 15 |
| 3 | 472 |
| 4 | 23109 |
| 5 | 1544236 |
| 6 | 131066427 |
| 7 | 13504084084 |
| 8 | 1637471184585 |
| 9 | 228472604080636 |
| 10 | 36059751069011079 |
| 11 | 6352095608437311844 |
| 12 | 1235464848177560948685 |
| 13 | 262972526121658780180300 |
| 14 | 60804392657638382942192691 |
| 15 | 15176441397584819546121452692 |
| 16 | 4066926719970372629975938096017 |
[1,1,15,472,23109,1544236,131066427,13504084084, 1637471184585,228472604080636,36059751069011079, 6352095608437311844,1235464848177560948685, 262972526121658780180300, 60804392657638382942192691, 15176441397584819546121452692, 4066926719970372629975938096017] |