n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 14 |
3 | 52 |
4 | 217 |
5 | 1040 |
6 | 5768 |
7 | 36992 |
8 | 272584 |
9 | 2285184 |
10 | 21550656 |
11 | 226071744 |
12 | 2611146384 |
13 | 32911082496 |
14 | 449243785728 |
15 | 6598780563456 |
16 | 103734755882496 |
17 | 1737181702840320 |
18 | 30866291090657280 |
19 | 579859321408266240 |
[1,4,14,52,217,1040,5768,36992,272584,2285184, 21550656,226071744,2611146384,32911082496, 449243785728,6598780563456,103734755882496, 1737181702840320,30866291090657280, 579859321408266240] |