n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | -1 |
3 | 5 |
4 | -20 |
5 | 136 |
6 | -976 |
7 | 8840 |
8 | -88640 |
9 | 1019776 |
10 | -12933376 |
11 | 181318400 |
12 | -2767631360 |
13 | 45821372416 |
14 | -816582578176 |
15 | 15596531778560 |
16 | -317710534983680 |
17 | 6876972491309056 |
18 | -157606194409701376 |
19 | 3812752893951672320 |
20 | -97090584769337753600 |
21 | 2596013487025352605696 |
[0,1,-1,5,-20,136,-976,8840,-88640,1019776, -12933376,181318400,-2767631360,45821372416, -816582578176,15596531778560,-317710534983680, 6876972491309056,-157606194409701376, 3812752893951672320,-97090584769337753600, 2596013487025352605696] |