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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 14 |
| 9 | 118 |
| 10 | 780 |
| 11 | 4466 |
| 12 | 23276 |
| 13 | 113620 |
| 14 | 528840 |
| 15 | 2375100 |
| 16 | 10378056 |
| 17 | 44381832 |
| 18 | 186574864 |
| 19 | 773564328 |
| 20 | 3171317360 |
| 21 | 12880883408 |
| 22 | 51915526432 |
| 23 | 207893871472 |
| 24 | 827983736608 |
[1,14,118,780,4466,23276,113620,528840,2375100, 10378056,44381832,186574864,773564328,3171317360, 12880883408,51915526432,207893871472,827983736608] |