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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 15042 |
| 4 | 18059184 |
| 5 | 11195742340 |
| 6 | 5293792219344 |
| 7 | 2205450812336100 |
| 8 | 861515212667884608 |
| 9 | 324837276666570610668 |
| 10 | 119915580982794765091280 |
| 11 | 43656420088142545411963444 |
| 12 | 15735834864508561392982184160 |
| 13 | 5628506716816811122561964710428 |
| 14 | 2000722502787397537117555256499248 |
[0,2,15042,18059184,11195742340,5293792219344, 2205450812336100,861515212667884608, 324837276666570610668,119915580982794765091280, 43656420088142545411963444, 15735834864508561392982184160, 5628506716816811122561964710428, 2000722502787397537117555256499248] |