n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 25 |
6 | 90 |
7 | 301 |
8 | 967 |
9 | 3061 |
10 | 10080 |
11 | 40381 |
12 | 245553 |
13 | 2161238 |
14 | 21701381 |
15 | 219007491 |
16 | 2149071359 |
17 | 20442363031 |
18 | 189226358659 |
19 | 1712836890912 |
20 | 15232581945180 |
21 | 133717667932475 |
22 | 1164901223314180 |
23 | 10143255631462661 |
24 | 89207257764369032 |
25 | 804712211338739040 |
[0,0,0,1,6,25,90,301,967,3061,10080,40381,245553, 2161238,21701381,219007491,2149071359,20442363031, 189226358659,1712836890912,15232581945180, 133717667932475,1164901223314180, 10143255631462661,89207257764369032, 804712211338739040] |