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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 0 |
| 2 | 450 |
| 3 | 2240 |
| 4 | 1786050 |
| 5 | 30888000 |
| 6 | 36926539650 |
| 7 | 1356752592000 |
| 8 | 2425187135621250 |
| 9 | 154415644664112000 |
| 10 | 389167059569139101250 |
| 11 | 38253175174710405000000 |
| 12 | 129492439672113021377981250 |
[2,0,450,2240,1786050,30888000,36926539650, 1356752592000,2425187135621250,154415644664112000, 389167059569139101250,38253175174710405000000, 129492439672113021377981250] |