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| n | a(n) |
|---|---|
| 3 | 12 |
| 4 | 72 |
| 5 | 300 |
| 6 | 1080 |
| 7 | 3612 |
| 8 | 11592 |
| 9 | 36300 |
| 10 | 111960 |
| 11 | 342012 |
| 12 | 1038312 |
| 13 | 3139500 |
| 14 | 9467640 |
| 15 | 28501212 |
| 16 | 85700232 |
| 17 | 257493900 |
| 18 | 773268120 |
| 19 | 2321377212 |
| 20 | 6967277352 |
| 21 | 20908123500 |
| 22 | 62736953400 |
| 23 | 188236026012 |
| 24 | 564758409672 |
| 25 | 1694375892300 |
[12,72,300,1080,3612,11592,36300,111960,342012, 1038312,3139500,9467640,28501212,85700232, 257493900,773268120,2321377212,6967277352, 20908123500,62736953400,188236026012,564758409672, 1694375892300] |