n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 5 |
4 | 23 |
5 | 118 |
6 | 710 |
7 | 4980 |
8 | 39902 |
9 | 359536 |
10 | 3598695 |
11 | 39615625 |
12 | 475687486 |
13 | 6187239475 |
14 | 86661001740 |
15 | 1300430722199 |
16 | 20814114415223 |
17 | 353948328666100 |
18 | 6372804626194309 |
19 | 121112786592293963 |
20 | 2422786846761133393 |
21 | 50888617325509644403 |
[0,0,1,5,23,118,710,4980,39902,359536,3598695, 39615625,475687486,6187239475,86661001740, 1300430722199,20814114415223,353948328666100, 6372804626194309,121112786592293963, 2422786846761133393,50888617325509644403] |