n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 8 |
4 | 28 |
5 | 142 |
6 | 540 |
7 | 2585 |
8 | 11343 |
9 | 51501 |
10 | 233028 |
11 | 1052448 |
12 | 4769842 |
13 | 21579345 |
14 | 97715668 |
15 | 442378911 |
16 | 2002838338 |
17 | 9067930634 |
18 | 41054700887 |
19 | 185876096558 |
20 | 841553822832 |
21 | 3810142997823 |
22 | 17250454214015 |
23 | 78101569076062 |
[0,4,8,28,142,540,2585,11343,51501,233028,1052448, 4769842,21579345,97715668,442378911,2002838338, 9067930634,41054700887,185876096558,841553822832, 3810142997823,17250454214015,78101569076062] |