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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 7 |
| 2 | 141 |
| 3 | 2576 |
| 4 | 46347 |
| 5 | 831985 |
| 6 | 14930208 |
| 7 | 267913919 |
| 8 | 4807525989 |
| 9 | 86267568688 |
| 10 | 1548008749155 |
| 11 | 27777890017577 |
| 12 | 498454011832896 |
| 13 | 8944394323670071 |
| 14 | 160500643816049277 |
| 15 | 2880067194369984080 |
| 16 | 51680708854856144763 |
| 17 | 927372692193073296289 |
[0,7,141,2576,46347,831985,14930208,267913919, 4807525989,86267568688,1548008749155, 27777890017577,498454011832896,8944394323670071, 160500643816049277,2880067194369984080, 51680708854856144763,927372692193073296289] |