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| n | a(n) |
|---|---|
| 1 | 672 |
| 2 | 2016 |
| 3 | 69300 |
| 4 | 146160 |
| 5 | 207900 |
| 6 | 1627920 |
| 7 | 8316000 |
| 8 | 9828000 |
| 9 | 38253600 |
| 10 | 60147360 |
| 11 | 105814800 |
| 12 | 158004000 |
| 13 | 726818400 |
| 14 | 95935039200 |
| 15 | 191870078400 |
| 16 | 2206505901600 |
| 17 | 3463953292800 |
| 18 | 3800093497200 |
| 19 | 4413011803200 |
| 20 | 7600186994400 |
| 21 | 8826023606400 |
[672,2016,69300,146160,207900,1627920,8316000, 9828000,38253600,60147360,105814800,158004000, 726818400,95935039200,191870078400,2206505901600, 3463953292800,3800093497200,4413011803200, 7600186994400,8826023606400] |