n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 16 |
3 | 76 |
4 | 416 |
5 | 2576 |
6 | 17840 |
7 | 137268 |
8 | 1170104 |
9 | 11050940 |
10 | 115885968 |
11 | 1353366864 |
12 | 17640817784 |
13 | 256630492660 |
14 | 4153220868128 |
15 | 74315436120300 |
16 | 1458541231513152 |
17 | 31131651836906752 |
18 | 716862465409883040 |
19 | 17683184383300077828 |
20 | 464519709712796199816 |
[1,4,16,76,416,2576,17840,137268,1170104,11050940, 115885968,1353366864,17640817784,256630492660, 4153220868128,74315436120300,1458541231513152, 31131651836906752,716862465409883040, 17683184383300077828,464519709712796199816] |