n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 18 |
3 | 100 |
4 | 611 |
5 | 3964 |
6 | 26796 |
7 | 186664 |
8 | 1330541 |
9 | 9657748 |
10 | 71138964 |
11 | 530417668 |
12 | 3995461515 |
13 | 30359913132 |
14 | 232434013174 |
15 | 1791205897652 |
16 | 13883372595753 |
17 | 108159238126644 |
18 | 846472588860134 |
19 | 6651825146945508 |
20 | 52465622957295300 |
21 | 415208597109815172 |
[1,4,18,100,611,3964,26796,186664,1330541,9657748, 71138964,530417668,3995461515,30359913132, 232434013174,1791205897652,13883372595753, 108159238126644,846472588860134,6651825146945508, 52465622957295300,415208597109815172] |