n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 14 |
4 | 58 |
5 | 300 |
6 | 1886 |
7 | 13878 |
8 | 116310 |
9 | 1090500 |
10 | 11296810 |
11 | 128102714 |
12 | 1578342010 |
13 | 20998804576 |
14 | 300081098918 |
15 | 4584908039142 |
16 | 74594230462318 |
17 | 1287634918033836 |
18 | 23506502407089874 |
19 | 452508152936326482 |
[0,1,4,14,58,300,1886,13878,116310,1090500, 11296810,128102714,1578342010,20998804576, 300081098918,4584908039142,74594230462318, 1287634918033836,23506502407089874, 452508152936326482] |