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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 30 |
| 3 | 2318 |
| 4 | 115630 |
| 5 | 5524854 |
| 6 | 261026756 |
| 7 | 12303458948 |
| 8 | 580318201510 |
| 9 | 27360277625336 |
| 10 | 1290051189888410 |
| 11 | 60825460594828982 |
| 12 | 2867902503350552074 |
| 13 | 135220715263225157514 |
| 14 | 6375614702009353176064 |
| 15 | 300608248114662965834544 |
[0,30,2318,115630,5524854,261026756,12303458948, 580318201510,27360277625336,1290051189888410, 60825460594828982,2867902503350552074, 135220715263225157514,6375614702009353176064, 300608248114662965834544] |