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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 216 |
| 3 | 2050 |
| 4 | 47696 |
| 5 | 419562 |
| 6 | 12765040 |
| 7 | 126928736 |
| 8 | 4292369132 |
| 9 | 46437072442 |
| 10 | 1665124000236 |
| 11 | 18888312086238 |
| 12 | 693531743163910 |
| 13 | 8036001935941558 |
| 14 | 298077593903645728 |
| 15 | 3488969551802753323 |
| 16 | 130077277806080796677 |
[0,216,2050,47696,419562,12765040,126928736, 4292369132,46437072442,1665124000236, 18888312086238,693531743163910,8036001935941558, 298077593903645728,3488969551802753323, 130077277806080796677] |