n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 16 |
6 | 120 |
7 | 888 |
8 | 7198 |
9 | 64968 |
10 | 650644 |
11 | 7165200 |
12 | 86059242 |
13 | 1119549472 |
14 | 15682257872 |
15 | 235336043976 |
16 | 3766695159030 |
17 | 64052134910168 |
18 | 1153211148654348 |
19 | 21915344800505888 |
20 | 438380075974889154 |
21 | 9207290871553008240 |
22 | 202585136417883766472 |
23 | 4659950328485470292632 |
[0,0,0,0,2,16,120,888,7198,64968,650644,7165200, 86059242,1119549472,15682257872,235336043976, 3766695159030,64052134910168,1153211148654348, 21915344800505888,438380075974889154, 9207290871553008240,202585136417883766472, 4659950328485470292632] |