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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 514 |
| 4 | 113920 |
| 5 | 44084375 |
| 6 | 28195584256 |
| 7 | 28201577788944 |
| 8 | 42039291307622400 |
| 9 | 89651019067859485125 |
| 10 | 264184676314240000000000 |
| 11 | 1044528435971290465713291136 |
| 12 | 5403748103160416506028643844096 |
| 13 | 35801791315095649217787108688094375 |
[0,4,514,113920,44084375,28195584256, 28201577788944,42039291307622400, 89651019067859485125,264184676314240000000000, 1044528435971290465713291136, 5403748103160416506028643844096, 35801791315095649217787108688094375] |