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| n | a(n) |
|---|---|
| 1 | 216 |
| 2 | 15540 |
| 3 | 872460 |
| 4 | 43964700 |
| 5 | 2085484068 |
| 6 | 95166487524 |
| 7 | 4227147007836 |
| 8 | 184069947098892 |
| 9 | 7894012975085748 |
| 10 | 334480929126425748 |
| 11 | 14034341507370527532 |
| 12 | 584107408947764887164 |
| 13 | 24145251769444080595908 |
[216,15540,872460,43964700,2085484068,95166487524, 4227147007836,184069947098892,7894012975085748, 334480929126425748,14034341507370527532, 584107408947764887164,24145251769444080595908] |