n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 0 |
4 | 44 |
5 | -220 |
6 | 2056 |
7 | -19544 |
8 | 213216 |
9 | -2571552 |
10 | 34036224 |
11 | -489916416 |
12 | 7614555648 |
13 | -127028029440 |
14 | 2262903109632 |
15 | -42857715985920 |
16 | 859647858427392 |
17 | -18200106158320128 |
18 | 405498290896693248 |
19 | -9482120962982547456 |
20 | 232156555727228971008 |
[1,1,4,0,44,-220,2056,-19544,213216,-2571552, 34036224,-489916416,7614555648,-127028029440, 2262903109632,-42857715985920,859647858427392, -18200106158320128,405498290896693248, -9482120962982547456,232156555727228971008] |