n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 12 |
3 | 64 |
4 | 404 |
5 | 2352 |
6 | 14396 |
7 | 85608 |
8 | 517796 |
9 | 3100928 |
10 | 18678652 |
11 | 112130536 |
12 | 674473028 |
13 | 4052292096 |
14 | 24363059260 |
15 | 146416625608 |
16 | 880136072420 |
17 | 5289934135040 |
18 | 31796930379452 |
19 | 191117281480168 |
20 | 1148752620931652 |
21 | 6904721644495296 |
22 | 41502080416224764 |
[1,2,12,64,404,2352,14396,85608,517796,3100928, 18678652,112130536,674473028,4052292096, 24363059260,146416625608,880136072420, 5289934135040,31796930379452,191117281480168, 1148752620931652,6904721644495296, 41502080416224764] |