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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 56 |
| 9 | 420 |
| 10 | 3150 |
| 11 | 24024 |
| 12 | 187110 |
| 13 | 1497210 |
| 14 | 12321309 |
| 15 | 104379275 |
| 16 | 910501592 |
| 17 | 8176340536 |
| 18 | 75557540604 |
| 19 | 718108992888 |
| 20 | 7015008076980 |
| 21 | 70388350377492 |
| 22 | 724955013327237 |
| 23 | 7658820319677219 |
| 24 | 82939240748756392 |
| 25 | 920067296840668900 |
| 26 | 10448713239329294930 |
[1,7,56,420,3150,24024,187110,1497210,12321309, 104379275,910501592,8176340536,75557540604, 718108992888,7015008076980,70388350377492, 724955013327237,7658820319677219, 82939240748756392,920067296840668900, 10448713239329294930] |