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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 23 |
| 3 | 715 |
| 4 | 40297 |
| 5 | 3628681 |
| 6 | 479000881 |
| 7 | 87178286161 |
| 8 | 20922789847681 |
| 9 | 6402373705365121 |
| 10 | 2432902008173011201 |
| 11 | 1124000727777567763201 |
| 12 | 620448401733238960358401 |
| 13 | 403291461126605629356979201 |
| 14 | 304888344611713860414325708801 |
| 15 | 265252859812191058635000805632001 |
[1,2,23,715,40297,3628681,479000881,87178286161, 20922789847681,6402373705365121, 2432902008173011201,1124000727777567763201, 620448401733238960358401, 403291461126605629356979201, 304888344611713860414325708801, 265252859812191058635000805632001] |