n | a(n) |
---|---|
1 | 4 |
2 | 23 |
3 | 113 |
4 | 582 |
5 | 2981 |
6 | 15266 |
7 | 78188 |
8 | 400542 |
9 | 2051667 |
10 | 10509067 |
11 | 53831920 |
12 | 275740995 |
13 | 1412438656 |
14 | 7234951864 |
15 | 37059718148 |
16 | 189831642853 |
17 | 972377820507 |
18 | 4980827553280 |
19 | 25513377870835 |
20 | 130687610786192 |
21 | 669423377137934 |
[4,23,113,582,2981,15266,78188,400542,2051667, 10509067,53831920,275740995,1412438656,7234951864, 37059718148,189831642853,972377820507, 4980827553280,25513377870835,130687610786192, 669423377137934] |