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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 571 |
| 3 | 8820 |
| 4 | 120841 |
| 5 | 1533210 |
| 6 | 18457111 |
| 7 | 213985200 |
| 8 | 2412703381 |
| 9 | 26633396790 |
| 10 | 289205203651 |
| 11 | 3099825799980 |
| 12 | 32880061861921 |
| 13 | 345809114026770 |
| 14 | 3611607266342191 |
| 15 | 37500386320109160 |
| 16 | 387478849831268461 |
[1,30,571,8820,120841,1533210,18457111,213985200, 2412703381,26633396790,289205203651,3099825799980, 32880061861921,345809114026770,3611607266342191, 37500386320109160,387478849831268461] |