n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 40 |
4 | 128 |
5 | 412 |
6 | 1251 |
7 | 4026 |
8 | 12362 |
9 | 39624 |
10 | 120012 |
11 | 379132 |
12 | 1130914 |
13 | 3530916 |
14 | 10402781 |
15 | 32112656 |
16 | 93427431 |
[1,4,12,40,128,412,1251,4026,12362,39624,120012, 379132,1130914,3530916,10402781,32112656,93427431] |