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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 5 |
| 5 | 90 |
| 6 | 582 |
| 7 | 4081 |
| 8 | 45678 |
| 9 | 378049 |
| 10 | 3844532 |
| 11 | 39039539 |
| 12 | 395170118 |
| 13 | 4589810849 |
| 14 | 53154371025 |
| 15 | 660113986997 |
| 16 | 8584476248237 |
| 17 | 113555197832758 |
| 18 | 1572878837435750 |
| 19 | 22259911738401660 |
| 20 | 324143769099772448 |
| 21 | 4869443438412466557 |
| 22 | 74837370448784241452 |
| 23 | 1182177603062005007658 |
[1,1,2,6,5,90,582,4081,45678,378049,3844532, 39039539,395170118,4589810849,53154371025, 660113986997,8584476248237,113555197832758, 1572878837435750,22259911738401660, 324143769099772448,4869443438412466557, 74837370448784241452,1182177603062005007658] |