n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 16 |
3 | 66 |
4 | 304 |
5 | 1332 |
6 | 5968 |
7 | 26472 |
8 | 117952 |
9 | 524496 |
10 | 2334400 |
11 | 10385568 |
12 | 46213120 |
13 | 205619520 |
14 | 914912512 |
15 | 4070872704 |
16 | 18113348608 |
17 | 80595074304 |
18 | 358607125504 |
19 | 1595618388480 |
20 | 7099688329216 |
21 | 31589989045248 |
22 | 140559334936576 |
[1,3,16,66,304,1332,5968,26472,117952,524496, 2334400,10385568,46213120,205619520,914912512, 4070872704,18113348608,80595074304,358607125504, 1595618388480,7099688329216,31589989045248, 140559334936576] |