n | a(n) |
---|---|
0 | 4 |
1 | 21 |
2 | 110 |
3 | 576 |
4 | 3016 |
5 | 15792 |
6 | 82688 |
7 | 432960 |
8 | 2267008 |
9 | 11870208 |
10 | 62153216 |
11 | 325438464 |
12 | 1704017920 |
13 | 8922353664 |
14 | 46718050304 |
15 | 244618887168 |
16 | 1280841121792 |
17 | 6706571182080 |
18 | 35116062605312 |
19 | 183870090903552 |
20 | 962756295000064 |
21 | 5041057406386176 |
22 | 26395319258316800 |
[4,21,110,576,3016,15792,82688,432960,2267008, 11870208,62153216,325438464,1704017920,8922353664, 46718050304,244618887168,1280841121792, 6706571182080,35116062605312,183870090903552, 962756295000064,5041057406386176, 26395319258316800] |