n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 16 |
6 | 96 |
7 | 510 |
8 | 2558 |
9 | 12282 |
10 | 57498 |
11 | 263421 |
12 | 1192480 |
13 | 5330078 |
14 | 23657520 |
15 | 104106655 |
16 | 455993276 |
17 | 1984733843 |
18 | 8609546380 |
19 | 37164674383 |
[0,0,0,2,16,96,510,2558,12282,57498,263421, 1192480,5330078,23657520,104106655,455993276, 1984733843,8609546380,37164674383] |