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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 63 |
| 3 | 980 |
| 4 | 20305 |
| 5 | 526890 |
| 6 | 16451071 |
| 7 | 600940872 |
| 8 | 25154396001 |
| 9 | 1187422368110 |
| 10 | 62418042417599 |
| 11 | 3616337930622300 |
| 12 | 228977061309711793 |
| 13 | 15731733543660288210 |
| 14 | 1165677769357309014015 |
| 15 | 92665403695822344828176 |
[1,6,63,980,20305,526890,16451071,600940872, 25154396001,1187422368110,62418042417599, 3616337930622300,228977061309711793, 15731733543660288210,1165677769357309014015, 92665403695822344828176] |