n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 21 |
5 | 44 |
6 | 1045 |
7 | 2694 |
8 | 74473 |
9 | 421784 |
10 | 8776521 |
11 | 52518410 |
12 | 1843753021 |
13 | 11476952772 |
14 | 387068115421 |
15 | 4277646186254 |
16 | 125796357803985 |
17 | 1343857519264304 |
18 | 53205974734877713 |
19 | 621203524858308114 |
20 | 25357790175078682981 |
21 | 388778926109137187420 |
[1,0,1,2,21,44,1045,2694,74473,421784,8776521, 52518410,1843753021,11476952772,387068115421, 4277646186254,125796357803985,1343857519264304, 53205974734877713,621203524858308114, 25357790175078682981,388778926109137187420] |