n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 48 |
6 | 120 |
7 | 888 |
8 | 2198 |
9 | 22120 |
10 | 54304 |
11 | 685368 |
12 | 1674468 |
13 | 25344480 |
14 | 61736880 |
15 | 1087931184 |
16 | 2644978110 |
17 | 53138966904 |
18 | 129019925424 |
19 | 2909014993080 |
20 | 7056278570108 |
21 | 176372774697856 |
22 | 427516982398576 |
23 | 11729862804913680 |
24 | 28417031969575260 |
25 | 848948339328178128 |
[1,1,2,4,10,48,120,888,2198,22120,54304,685368, 1674468,25344480,61736880,1087931184,2644978110, 53138966904,129019925424,2909014993080, 7056278570108,176372774697856,427516982398576, 11729862804913680,28417031969575260, 848948339328178128] |