n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 40 |
5 | 321 |
6 | 3356 |
7 | 45123 |
8 | 752256 |
9 | 15018433 |
10 | 355378732 |
11 | 9823042923 |
12 | 311510611072 |
13 | 11242338245009 |
14 | 458052976883672 |
15 | 20851748359005567 |
16 | 1054108827258438656 |
17 | 58860837547461314049 |
18 | 3606677286494115444812 |
19 | 241397002229305033296603 |
20 | 17579096976247770110062080 |
[1,1,2,7,40,321,3356,45123,752256,15018433, 355378732,9823042923,311510611072,11242338245009, 458052976883672,20851748359005567, 1054108827258438656,58860837547461314049, 3606677286494115444812,241397002229305033296603, 17579096976247770110062080] |