n | a(n) |
---|---|
0 | 2 |
1 | 7 |
2 | 22 |
3 | 69 |
4 | 212 |
5 | 644 |
6 | 1936 |
7 | 5772 |
8 | 17088 |
9 | 50288 |
10 | 147232 |
11 | 429136 |
12 | 1245888 |
13 | 3604544 |
14 | 10396160 |
15 | 29900992 |
16 | 85784064 |
17 | 245548800 |
18 | 701402624 |
19 | 1999734016 |
20 | 5691409408 |
21 | 16172221440 |
22 | 45885403136 |
23 | 130011401216 |
24 | 367902195712 |
25 | 1039836672000 |
26 | 2935713865728 |
27 | 8279592292352 |
[2,7,22,69,212,644,1936,5772,17088,50288,147232, 429136,1245888,3604544,10396160,29900992,85784064, 245548800,701402624,1999734016,5691409408, 16172221440,45885403136,130011401216,367902195712, 1039836672000,2935713865728,8279592292352] |