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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 390 |
| 2 | 331500 |
| 3 | 355699500 |
| 4 | 428760177300 |
| 5 | 554472661284360 |
| 6 | 751706507941225200 |
| 7 | 1054268377387568343000 |
| 8 | 1516916483664479584186500 |
| 9 | 2226631142488300765641223800 |
| 10 | 3321243012135549422030449420080 |
| 11 | 5019605916068500831023292873530000 |
| 12 | 7670343963284674539098285610205650000 |
[1,390,331500,355699500,428760177300, 554472661284360,751706507941225200, 1054268377387568343000,1516916483664479584186500, 2226631142488300765641223800, 3321243012135549422030449420080, 5019605916068500831023292873530000, 7670343963284674539098285610205650000] |