n | a(n) |
---|---|
1 | 4 |
2 | 20 |
3 | 58 |
4 | 290 |
5 | 1217 |
6 | 5110 |
7 | 21969 |
8 | 93666 |
9 | 399920 |
10 | 1714601 |
11 | 7351903 |
12 | 31469992 |
13 | 134862960 |
14 | 577985643 |
15 | 2477090793 |
16 | 10617586380 |
17 | 45512098214 |
18 | 195087643326 |
19 | 836266725394 |
20 | 3584843949857 |
21 | 15367390560222 |
22 | 65877090945921 |
[4,20,58,290,1217,5110,21969,93666,399920,1714601, 7351903,31469992,134862960,577985643,2477090793, 10617586380,45512098214,195087643326,836266725394, 3584843949857,15367390560222,65877090945921] |