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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 10 |
| 3 | 90 |
| 4 | 825 |
| 5 | 8445 |
| 6 | 92820 |
| 7 | 1066740 |
| 8 | 12670635 |
| 9 | 154308775 |
| 10 | 1916370170 |
| 11 | 24177471370 |
| 12 | 309007779015 |
| 13 | 3992428316835 |
| 14 | 52059968802000 |
| 15 | 684240882022800 |
| 16 | 9055282215370050 |
| 17 | 120563388411386850 |
| 18 | 1613785688724362400 |
[1,5,10,90,825,8445,92820,1066740,12670635, 154308775,1916370170,24177471370,309007779015, 3992428316835,52059968802000,684240882022800, 9055282215370050,120563388411386850, 1613785688724362400] |