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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 870 |
| 3 | 24795 |
| 4 | 706440 |
| 5 | 20121360 |
| 6 | 573111630 |
| 7 | 16323709080 |
| 8 | 464941707720 |
| 9 | 13242748348620 |
| 10 | 377187895691040 |
| 11 | 10743291699776160 |
| 12 | 305996872843541880 |
| 13 | 8715586321562342880 |
| 14 | 248242553013255652320 |
| 15 | 7070593171000425862320 |
[1,30,870,24795,706440,20121360,573111630, 16323709080,464941707720,13242748348620, 377187895691040,10743291699776160, 305996872843541880,8715586321562342880, 248242553013255652320,7070593171000425862320] |