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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 12 |
| 3 | 2835 |
| 4 | 2520 |
| 5 | 467775 |
| 6 | 935550 |
| 7 | 127702575 |
| 8 | 10216206000 |
| 9 | 31892150847375 |
| 10 | 18561569276250 |
| 11 | 147926426347074375 |
| 12 | 34806217964017500 |
| 13 | 144228265688397515625 |
| 14 | 9086380738369043484375 |
| 15 | 3691877481305923483089140625 |
| 16 | 3920955016221009644377500000 |
| 17 | 206217727884373725983979140625 |
| 18 | 43305722855718482456635619531250 |
[1,6,12,2835,2520,467775,935550,127702575, 10216206000,31892150847375,18561569276250, 147926426347074375,34806217964017500, 144228265688397515625,9086380738369043484375, 3691877481305923483089140625, 3920955016221009644377500000, 206217727884373725983979140625, 43305722855718482456635619531250] |