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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 11 |
| 5 | 320 |
| 6 | 71648 |
| 7 | 55717584 |
| 8 | 213773992667 |
| 9 | 3437213982024260 |
| 10 | 249555807519163873078 |
| 11 | 78627163663841340597702692 |
| 12 | 109477494899001088619906813170744 |
| 13 | 666376868834051436218404625691790011056 |
| 14 | 17813932068751803215543399261217225231408150272 |
| 15 | 2084618062581510894785237376608868017658716989948775752 |
| 16 | 1069049587048126292657245511018395164729584995637677006604201633 |
| 17 | 2399885835948485973061191866831331382214612321025714609065977840609754872 |
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