n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 16 |
6 | 46 |
7 | 106 |
8 | 316 |
9 | 1324 |
10 | 5356 |
11 | 18316 |
12 | 63856 |
13 | 272416 |
14 | 1264264 |
15 | 5409496 |
16 | 22302736 |
17 | 101343376 |
18 | 507711376 |
19 | 2495918224 |
20 | 11798364736 |
21 | 58074029056 |
22 | 309240315616 |
23 | 1670570920096 |
24 | 8792390355904 |
25 | 46886941456576 |
26 | 264381946998976 |
27 | 1533013006902976 |
[1,1,1,1,4,16,46,106,316,1324,5356,18316,63856, 272416,1264264,5409496,22302736,101343376, 507711376,2495918224,11798364736,58074029056, 309240315616,1670570920096,8792390355904, 46886941456576,264381946998976,1533013006902976] |