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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 0 |
| 3 | 84 |
| 4 | 0 |
| 5 | 276892 |
| 6 | 0 |
| 7 | 111457917800 |
| 8 | 0 |
| 9 | 6660816097416169260 |
| 10 | 0 |
| 11 | 66597307693046550483175282456 |
| 12 | 0 |
| 13 | 120167520447600665027319450022840022638104 |
| 14 | 0 |
| 15 | 41233407800231936275686869695450406221641586822849599440 |
| 16 | 0 |
| 17 | 2796405930832642696090353299413183601303402593622351242536692586333202380 |
| 18 | 0 |
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