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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 23 |
| 5 | 256 |
| 6 | 5319 |
| 7 | 209868 |
| 8 | 15912975 |
| 9 | 2343052576 |
| 10 | 675360194287 |
| 11 | 383292136232380 |
| 12 | 430038382710483623 |
| 13 | 956430459603341708896 |
| 14 | 4224538833207707658410103 |
| 15 | 37106500399796746894085512140 |
| 16 | 648740170822904504303462104598943 |
[0,1,1,4,23,256,5319,209868,15912975,2343052576, 675360194287,383292136232380,430038382710483623, 956430459603341708896,4224538833207707658410103, 37106500399796746894085512140, 648740170822904504303462104598943] |