n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 16 |
6 | 85 |
7 | 533 |
8 | 3888 |
9 | 32268 |
10 | 300193 |
11 | 3093377 |
12 | 34970468 |
13 | 430293488 |
14 | 5724411845 |
15 | 81871668773 |
16 | 1252691817856 |
17 | 20417647146396 |
18 | 353169795861921 |
19 | 6461418976274657 |
20 | 124664729763630436 |
[0,0,1,1,4,16,85,533,3888,32268,300193,3093377, 34970468,430293488,5724411845,81871668773, 1252691817856,20417647146396,353169795861921, 6461418976274657,124664729763630436] |