n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 25 |
5 | 220 |
6 | 2485 |
7 | 34300 |
8 | 559405 |
9 | 10525900 |
10 | 224449225 |
11 | 5348843500 |
12 | 140880765025 |
13 | 4063875715900 |
14 | 127418482316125 |
15 | 4314607214417500 |
16 | 156920190449147125 |
17 | 6100643259005795500 |
18 | 252476539015516440625 |
19 | 11081983532721088487500 |
20 | 514215436341672155715625 |
[0,1,1,4,25,220,2485,34300,559405,10525900, 224449225,5348843500,140880765025,4063875715900, 127418482316125,4314607214417500, 156920190449147125,6100643259005795500, 252476539015516440625,11081983532721088487500, 514215436341672155715625] |