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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 3280 |
| 9 | 8069620 |
| 10 | 18326727760 |
| 11 | 40581331447162 |
| 12 | 89117945389585840 |
| 13 | 195168545232713290660 |
| 14 | 427028776969176679964080 |
| 15 | 934054234760012359481199283 |
| 16 | 2042880353039758115797506899680 |
| 17 | 4467854961017673003571751798888920 |
[1,3280,8069620,18326727760,40581331447162, 89117945389585840,195168545232713290660, 427028776969176679964080, 934054234760012359481199283, 2042880353039758115797506899680, 4467854961017673003571751798888920] |