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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 16 |
| 5 | 125 |
| 6 | 711 |
| 7 | 5915 |
| 8 | 46264 |
| 9 | 438681 |
| 10 | 4371085 |
| 11 | 49321745 |
| 12 | 588219523 |
| 13 | 7751724513 |
| 14 | 108240044745 |
| 15 | 1633289839823 |
| 16 | 26102966544024 |
| 17 | 445098171557393 |
| 18 | 8006283582196761 |
| 19 | 152353662601600853 |
| 20 | 3046062181913575921 |
| 21 | 64015245150903376151 |
| 22 | 1408108698825029286195 |
[0,0,0,3,16,125,711,5915,46264,438681,4371085, 49321745,588219523,7751724513,108240044745, 1633289839823,26102966544024,445098171557393, 8006283582196761,152353662601600853, 3046062181913575921,64015245150903376151, 1408108698825029286195] |