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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 580 |
| 3 | 9240 |
| 4 | 132496 |
| 5 | 1784160 |
| 6 | 23095360 |
| 7 | 291434880 |
| 8 | 3616450816 |
| 9 | 44380976640 |
| 10 | 540619555840 |
| 11 | 6552897361920 |
| 12 | 79164966670336 |
| 13 | 954260234526720 |
| 14 | 11485602445803520 |
| 15 | 138104474808975360 |
| 16 | 1659480116122157056 |
[1,30,580,9240,132496,1784160,23095360,291434880, 3616450816,44380976640,540619555840,6552897361920, 79164966670336,954260234526720,11485602445803520, 138104474808975360,1659480116122157056] |