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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 108 |
| 3 | 6912 |
| 4 | 800000 |
| 5 | 145800000 |
| 6 | 38423222208 |
| 7 | 13816758796288 |
| 8 | 6499837226778624 |
| 9 | 3874204890000000000 |
| 10 | 2853116706110000000000 |
| 11 | 2543867514227405321404416 |
| 12 | 2700464873652770753916960768 |
| 13 | 3365550251744726983606907650048 |
| 14 | 4865879898782263021500000000000000 |
[1,4,108,6912,800000,145800000,38423222208, 13816758796288,6499837226778624, 3874204890000000000,2853116706110000000000, 2543867514227405321404416, 2700464873652770753916960768, 3365550251744726983606907650048, 4865879898782263021500000000000000] |