n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 28 |
4 | 268 |
5 | 3164 |
6 | 43672 |
7 | 682632 |
8 | 11834536 |
9 | 224283416 |
10 | 4597330748 |
11 | 101100605540 |
12 | 2370095338372 |
13 | 58924635472260 |
14 | 1546999678599872 |
15 | 42734731811302304 |
16 | 1238309697485975648 |
17 | 37538075865014728096 |
[1,1,4,28,268,3164,43672,682632,11834536, 224283416,4597330748,101100605540,2370095338372, 58924635472260,1546999678599872,42734731811302304, 1238309697485975648,37538075865014728096] |