n | a(n) |
---|---|
0 | 1 |
1 | 19 |
2 | 189 |
3 | 1311 |
4 | 7124 |
5 | 32300 |
6 | 127091 |
7 | 445721 |
8 | 1420364 |
9 | 4172476 |
10 | 11426240 |
11 | 29429784 |
12 | 71808030 |
13 | 166970290 |
14 | 371826581 |
15 | 796341623 |
16 | 1646167391 |
17 | 3294638285 |
18 | 6401307860 |
19 | 12102626403 |
20 | 22312161567 |
21 | 40184022241 |
22 | 70815180079 |
[1,19,189,1311,7124,32300,127091,445721,1420364, 4172476,11426240,29429784,71808030,166970290, 371826581,796341623,1646167391,3294638285, 6401307860,12102626403,22312161567,40184022241, 70815180079] |