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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 61 |
| 3 | 376 |
| 4 | 5580 |
| 5 | 79810 |
| 6 | 1117343 |
| 7 | 16062787 |
| 8 | 228184784 |
| 9 | 3255027240 |
| 10 | 46401757420 |
| 11 | 661366698927 |
| 12 | 9428675340241 |
| 13 | 134402077281152 |
| 14 | 1915938773275685 |
| 15 | 27311918408468448 |
| 16 | 389334703089935684 |
| 17 | 5550020585352043890 |
[0,61,376,5580,79810,1117343,16062787,228184784, 3255027240,46401757420,661366698927,9428675340241, 134402077281152,1915938773275685, 27311918408468448,389334703089935684, 5550020585352043890] |