n | a(n) |
---|---|
1 | 2 |
2 | 8 |
3 | 20 |
4 | 56 |
5 | 168 |
6 | 476 |
7 | 1364 |
8 | 3952 |
9 | 11360 |
10 | 32692 |
11 | 94236 |
12 | 271352 |
13 | 781432 |
14 | 2250892 |
15 | 6482724 |
16 | 18670784 |
17 | 53775312 |
18 | 154880036 |
19 | 446074860 |
20 | 1284760776 |
21 | 3700290152 |
22 | 10657349244 |
23 | 30694667380 |
24 | 88404940816 |
25 | 254618597952 |
26 | 733337259924 |
[2,8,20,56,168,476,1364,3952,11360,32692,94236, 271352,781432,2250892,6482724,18670784,53775312, 154880036,446074860,1284760776,3700290152, 10657349244,30694667380,88404940816,254618597952, 733337259924] |