n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 16 |
3 | 60 |
4 | 228 |
5 | 864 |
6 | 3264 |
7 | 12336 |
8 | 46632 |
9 | 176208 |
10 | 665892 |
11 | 2516412 |
12 | 9509364 |
13 | 35935476 |
14 | 135798588 |
15 | 513176076 |
16 | 1939267560 |
17 | 7328398344 |
[1,4,16,60,228,864,3264,12336,46632,176208,665892, 2516412,9509364,35935476,135798588,513176076, 1939267560,7328398344] |