n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 14 |
4 | 96 |
5 | 664 |
6 | 4660 |
7 | 33144 |
8 | 238448 |
9 | 1732112 |
10 | 12685428 |
11 | 93552700 |
12 | 694072720 |
13 | 5176136640 |
14 | 38777105120 |
15 | 291661779920 |
16 | 2201518518240 |
17 | 16670124621472 |
18 | 126586920736564 |
19 | 963723103197516 |
20 | 7354034055776864 |
21 | 56236603567496720 |
[0,2,14,96,664,4660,33144,238448,1732112,12685428, 93552700,694072720,5176136640,38777105120, 291661779920,2201518518240,16670124621472, 126586920736564,963723103197516,7354034055776864, 56236603567496720] |