n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 40 |
6 | 225 |
7 | 1071 |
8 | 8848 |
9 | 56232 |
10 | 616185 |
11 | 4880755 |
12 | 66475596 |
13 | 629398848 |
14 | 10238194057 |
15 | 112690225935 |
16 | 2130537219840 |
17 | 26719024870576 |
18 | 575573407212753 |
19 | 8099650628337987 |
20 | 195807849389362540 |
21 | 3054957193416951480 |
22 | 81892400673047263761 |
23 | 1402819397613793354063 |
24 | 41294565798306731368272 |
25 | 770446268109598573215000 |
[0,0,1,3,12,40,225,1071,8848,56232,616185,4880755, 66475596,629398848,10238194057,112690225935, 2130537219840,26719024870576,575573407212753, 8099650628337987,195807849389362540, 3054957193416951480,81892400673047263761, 1402819397613793354063,41294565798306731368272, 770446268109598573215000] |