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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 228 |
| 3 | 4800 |
| 4 | 76116 |
| 5 | 1094316 |
| 6 | 14557092 |
| 7 | 183735204 |
| 8 | 2230289220 |
| 9 | 26275912776 |
| 10 | 302338568832 |
| 11 | 3412921463352 |
| 12 | 37923555328200 |
| 13 | 415863933818988 |
| 14 | 4509400849281240 |
| 15 | 48428461587426108 |
| 16 | 515767225814395500 |
| 17 | 5452991323044249720 |
| 18 | 57282647077608267072 |
| 19 | 598324561437126968664 |
| 20 | 6217929367753246782612 |
[6,228,4800,76116,1094316,14557092,183735204, 2230289220,26275912776,302338568832,3412921463352, 37923555328200,415863933818988,4509400849281240, 48428461587426108,515767225814395500, 5452991323044249720,57282647077608267072, 598324561437126968664,6217929367753246782612] |