n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 24 |
6 | 58 |
7 | 140 |
8 | 338 |
9 | 816 |
10 | 1970 |
11 | 4756 |
12 | 11482 |
13 | 27720 |
14 | 66922 |
15 | 161564 |
16 | 390050 |
17 | 941664 |
18 | 2273378 |
19 | 5488420 |
20 | 13250218 |
21 | 31988856 |
22 | 77227930 |
23 | 186444716 |
24 | 450117362 |
25 | 1086679440 |
26 | 2623476242 |
27 | 6333631924 |
28 | 15290740090 |
29 | 36915112104 |
30 | 89120964298 |
31 | 215157040700 |
[0,2,4,10,24,58,140,338,816,1970,4756,11482,27720, 66922,161564,390050,941664,2273378,5488420, 13250218,31988856,77227930,186444716,450117362, 1086679440,2623476242,6333631924,15290740090, 36915112104,89120964298,215157040700] |