n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 4 |
3 | 32 |
4 | 80 |
5 | 372 |
6 | 1236 |
7 | 4912 |
8 | 17728 |
9 | 67364 |
10 | 248996 |
11 | 934080 |
12 | 3476400 |
13 | 12993364 |
14 | 48453364 |
15 | 180907472 |
16 | 675001760 |
17 | 2519449092 |
18 | 9402095556 |
19 | 35090331232 |
20 | 130956433168 |
21 | 488740993844 |
22 | 1823996357396 |
23 | 6807266805360 |
24 | 25405026124800 |
25 | 94812927172324 |
26 | 353846503607524 |
[0,4,4,32,80,372,1236,4912,17728,67364,248996, 934080,3476400,12993364,48453364,180907472, 675001760,2519449092,9402095556,35090331232, 130956433168,488740993844,1823996357396, 6807266805360,25405026124800,94812927172324, 353846503607524] |