n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 15 |
5 | 140 |
6 | 1915 |
7 | 33810 |
8 | 734545 |
9 | 18929960 |
10 | 564216345 |
11 | 19088149850 |
12 | 722508543295 |
13 | 30249199720740 |
14 | 1387823333771875 |
15 | 69238799231051450 |
16 | 3731906171773805025 |
17 | 216101966957781304400 |
18 | 13379538319131196637425 |
19 | 881962125004262056604850 |
[1,0,1,2,15,140,1915,33810,734545,18929960, 564216345,19088149850,722508543295,30249199720740, 1387823333771875,69238799231051450, 3731906171773805025,216101966957781304400, 13379538319131196637425,881962125004262056604850] |