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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 612 |
| 2 | 48996 |
| 3 | 1207680 |
| 4 | 12573540 |
| 5 | 73617480 |
| 6 | 318102912 |
| 7 | 1090632960 |
| 8 | 3176573796 |
| 9 | 8148505828 |
| 10 | 18918517320 |
| 11 | 40578145920 |
| 12 | 81375600000 |
| 13 | 154398101832 |
| 14 | 279331331328 |
| 15 | 484986858240 |
| 16 | 812932819812 |
| 17 | 1320330798792 |
| 18 | 2085523894756 |
| 19 | 3214498469760 |
| 20 | 4845373383240 |
| 21 | 7157876711424 |
| 22 | 10386510802560 |
[1,612,48996,1207680,12573540,73617480,318102912, 1090632960,3176573796,8148505828,18918517320, 40578145920,81375600000,154398101832,279331331328, 484986858240,812932819812,1320330798792, 2085523894756,3214498469760,4845373383240, 7157876711424,10386510802560] |