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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 2 |
| 4 | 12 |
| 5 | 58 |
| 6 | 300 |
| 7 | 1682 |
| 8 | 10332 |
| 9 | 69298 |
| 10 | 505500 |
| 11 | 3990362 |
| 12 | 33925452 |
| 13 | 309248938 |
| 14 | 3010070700 |
| 15 | 31167995042 |
| 16 | 342164637372 |
| 17 | 3970297978978 |
| 18 | 48558251523900 |
| 19 | 624386836023722 |
| 20 | 8421511353298092 |
| 21 | 118891756573779418 |
| 22 | 1753452275441153100 |
| 23 | 26967372781086764402 |
[0,2,12,58,300,1682,10332,69298,505500,3990362, 33925452,309248938,3010070700,31167995042, 342164637372,3970297978978,48558251523900, 624386836023722,8421511353298092, 118891756573779418,1753452275441153100, 26967372781086764402] |