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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 25 |
| 3 | 721 |
| 4 | 40321 |
| 5 | 3628801 |
| 6 | 479001601 |
| 7 | 87178291201 |
| 8 | 20922789888001 |
| 9 | 6402373705728001 |
| 10 | 2432902008176640001 |
| 11 | 1124000727777607680001 |
| 12 | 620448401733239439360001 |
| 13 | 403291461126605635584000001 |
| 14 | 304888344611713860501504000001 |
| 15 | 265252859812191058636308480000001 |
[2,3,25,721,40321,3628801,479001601,87178291201, 20922789888001,6402373705728001, 2432902008176640001,1124000727777607680001, 620448401733239439360001, 403291461126605635584000001, 304888344611713860501504000001, 265252859812191058636308480000001] |