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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 52 |
| 4 | 853 |
| 5 | 19291 |
| 6 | 557719 |
| 7 | 19657667 |
| 8 | 817847321 |
| 9 | 39236975668 |
| 10 | 2132767035851 |
| 11 | 129548751144077 |
| 12 | 8696909403827077 |
| 13 | 639445475893738749 |
| 14 | 51105213341360790655 |
| 15 | 4411321463887034379616 |
| 16 | 409004744372281965629617 |
| 17 | 40539225718259037965353203 |
[1,1,5,52,853,19291,557719,19657667,817847321, 39236975668,2132767035851,129548751144077, 8696909403827077,639445475893738749, 51105213341360790655,4411321463887034379616, 409004744372281965629617, 40539225718259037965353203] |