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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 91 |
| 6 | 541 |
| 7 | 1891 |
| 8 | 5041 |
| 9 | 249481 |
| 10 | 3424681 |
| 11 | 24365881 |
| 12 | 119821681 |
| 13 | 4208219731 |
| 14 | 96849813061 |
| 15 | 1133147785771 |
| 16 | 8728726799521 |
| 17 | 251218306095121 |
| 18 | 8116398738418321 |
| 19 | 138787857114672241 |
| 20 | 1523943014238675361 |
| 21 | 39648007379230971211 |
| 22 | 1599866285860593980461 |
[1,1,1,1,1,91,541,1891,5041,249481,3424681, 24365881,119821681,4208219731,96849813061, 1133147785771,8728726799521,251218306095121, 8116398738418321,138787857114672241, 1523943014238675361,39648007379230971211, 1599866285860593980461] |