n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 20 |
3 | 361 |
4 | 6480 |
5 | 116281 |
6 | 2086580 |
7 | 37442161 |
8 | 671872320 |
9 | 12056259601 |
10 | 216340800500 |
11 | 3882078149401 |
12 | 69661065888720 |
13 | 1250017107847561 |
14 | 22430646875367380 |
15 | 402501626648765281 |
16 | 7222598632802407680 |
17 | 129604273763794572961 |
18 | 2325654329115499905620 |
[0,1,20,361,6480,116281,2086580,37442161, 671872320,12056259601,216340800500,3882078149401, 69661065888720,1250017107847561,22430646875367380, 402501626648765281,7222598632802407680, 129604273763794572961,2325654329115499905620] |