n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 232 |
4 | 2248 |
5 | 24544 |
6 | 295456 |
7 | 3869632 |
8 | 54555328 |
9 | 821239552 |
10 | 13115934976 |
11 | 221076780544 |
12 | 3915685846528 |
13 | 72609585620992 |
14 | 1405168845395968 |
15 | 28302270409560064 |
16 | 591874919018500096 |
17 | 12824294700196052992 |
18 | 287350628454224478208 |
19 | 6647086535396002004992 |
[1,4,28,232,2248,24544,295456,3869632,54555328, 821239552,13115934976,221076780544,3915685846528, 72609585620992,1405168845395968,28302270409560064, 591874919018500096,12824294700196052992, 287350628454224478208,6647086535396002004992] |