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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 365 |
| 4 | 43801 |
| 5 | 21725297 |
| 6 | 43798198753 |
| 7 | 355991759464385 |
| 8 | 11619571028917526401 |
| 9 | 1520025803718875133673217 |
| 10 | 796153035368657542014822907393 |
| 11 | 1668838669721233396228446711227874305 |
| 12 | 13995815633937307151473642050515241531340801 |
[1,2,13,365,43801,21725297,43798198753, 355991759464385,11619571028917526401, 1520025803718875133673217, 796153035368657542014822907393, 1668838669721233396228446711227874305, 13995815633937307151473642050515241531340801] |