n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 8 |
3 | 168 |
4 | 714 |
5 | 1870 |
6 | 7920 |
7 | 54288 |
8 | 229970 |
9 | 602070 |
10 | 2550408 |
11 | 10803704 |
12 | 28284465 |
13 | 74049690 |
14 | 193864606 |
15 | 821223648 |
16 | 3478759200 |
17 | 9107509825 |
18 | 23843770274 |
19 | 62423800998 |
20 | 264431464440 |
21 | 1120149658760 |
22 | 2932589879121 |
23 | 7677619978602 |
[0,1,8,168,714,1870,7920,54288,229970,602070, 2550408,10803704,28284465,74049690,193864606, 821223648,3478759200,9107509825,23843770274, 62423800998,264431464440,1120149658760, 2932589879121,7677619978602] |