n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 136 |
4 | 604 |
5 | 2596 |
6 | 10308 |
7 | 41756 |
8 | 167884 |
9 | 666916 |
10 | 2644596 |
11 | 10503884 |
12 | 41783516 |
13 | 166468132 |
14 | 664068284 |
15 | 2651397964 |
[1,4,28,136,604,2596,10308,41756,167884,666916, 2644596,10503884,41783516,166468132,664068284, 2651397964] |