n | a(n) |
---|---|
0 | 4 |
1 | 8 |
2 | 16 |
3 | 40 |
4 | 111 |
5 | 306 |
6 | 882 |
7 | 2563 |
8 | 7513 |
9 | 22170 |
10 | 65602 |
11 | 194695 |
12 | 578949 |
13 | 1724117 |
14 | 5140568 |
15 | 15340177 |
16 | 45811041 |
17 | 136886318 |
18 | 409221920 |
19 | 1223856725 |
20 | 3661401440 |
21 | 10956876415 |
22 | 32796782398 |
23 | 98189738332 |
24 | 294021666926 |
25 | 880564233896 |
[4,8,16,40,111,306,882,2563,7513,22170,65602, 194695,578949,1724117,5140568,15340177,45811041, 136886318,409221920,1223856725,3661401440, 10956876415,32796782398,98189738332,294021666926, 880564233896] |