n | a(n) |
---|---|
0 | 1 |
1 | 18 |
2 | 252 |
3 | 3360 |
4 | 45360 |
5 | 635040 |
6 | 9313920 |
7 | 143700480 |
8 | 2335132800 |
9 | 39956716800 |
10 | 719220902400 |
11 | 13599813427200 |
12 | 269729632972800 |
13 | 5602076992512000 |
14 | 121645100408832000 |
15 | 2757288942600192000 |
16 | 65140951268929536000 |
17 | 1601701037083090944000 |
18 | 40932359836567879680000 |
[1,18,252,3360,45360,635040,9313920,143700480, 2335132800,39956716800,719220902400, 13599813427200,269729632972800,5602076992512000, 121645100408832000,2757288942600192000, 65140951268929536000,1601701037083090944000, 40932359836567879680000] |