n | a(n) |
---|---|
0 | 1 |
1 | 12 |
2 | 88 |
3 | 609 |
4 | 4180 |
5 | 28656 |
6 | 196417 |
7 | 1346268 |
8 | 9227464 |
9 | 63245985 |
10 | 433494436 |
11 | 2971215072 |
12 | 20365011073 |
13 | 139583862444 |
14 | 956722026040 |
15 | 6557470319841 |
16 | 44945570212852 |
17 | 308061521170128 |
18 | 2111485077978049 |
19 | 14472334024676220 |
20 | 99194853094755496 |
[1,12,88,609,4180,28656,196417,1346268,9227464, 63245985,433494436,2971215072,20365011073, 139583862444,956722026040,6557470319841, 44945570212852,308061521170128,2111485077978049, 14472334024676220,99194853094755496] |