n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 18 |
5 | 158 |
6 | 1788 |
7 | 23930 |
8 | 370886 |
9 | 6527064 |
10 | 128542420 |
11 | 2800362536 |
12 | 66858556196 |
13 | 1735834171276 |
14 | 48689118113374 |
15 | 1467253017578672 |
16 | 47275138863637080 |
17 | 1621757692715997136 |
18 | 59013695834307968254 |
19 | 2270400832166224741596 |
20 | 92078072790064946096284 |
[1,0,1,2,18,158,1788,23930,370886,6527064, 128542420,2800362536,66858556196,1735834171276, 48689118113374,1467253017578672,47275138863637080, 1621757692715997136,59013695834307968254, 2270400832166224741596,92078072790064946096284] |