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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 28 |
| 9 | 462 |
| 10 | 6300 |
| 11 | 82929 |
| 12 | 1128204 |
| 13 | 16187314 |
| 14 | 245722477 |
| 15 | 3944372432 |
| 16 | 66863837040 |
| 17 | 1194908786890 |
| 18 | 22468992674310 |
| 19 | 443708326841383 |
| 20 | 9184432111987960 |
| 21 | 198909290886899005 |
| 22 | 4499373643453767540 |
| 23 | 106128250525908452226 |
| 24 | 2606280798870785902866 |
| 25 | 66541442123879872392375 |
[1,28,462,6300,82929,1128204,16187314,245722477, 3944372432,66863837040,1194908786890, 22468992674310,443708326841383,9184432111987960, 198909290886899005,4499373643453767540, 106128250525908452226,2606280798870785902866, 66541442123879872392375] |