n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 8 |
4 | 30 |
5 | 156 |
6 | 900 |
7 | 6192 |
8 | 47904 |
9 | 422928 |
10 | 4138848 |
11 | 44864640 |
12 | 531227520 |
13 | 6836927040 |
14 | 94891046400 |
15 | 1413494219520 |
16 | 22481104677120 |
17 | 380261238681600 |
18 | 6814832064422400 |
19 | 128991143627965440 |
20 | 2571187988206540800 |
21 | 53834676521793638400 |
22 | 1181214133296983654400 |
[1,1,2,8,30,156,900,6192,47904,422928,4138848, 44864640,531227520,6836927040,94891046400, 1413494219520,22481104677120,380261238681600, 6814832064422400,128991143627965440, 2571187988206540800,53834676521793638400, 1181214133296983654400] |