n | a(n) |
---|---|
1 | 2 |
2 | 20 |
3 | 140 |
4 | 863 |
5 | 4962 |
6 | 27313 |
7 | 145932 |
8 | 763031 |
9 | 3924694 |
10 | 19928429 |
11 | 100145056 |
12 | 498967875 |
13 | 2468341930 |
14 | 12136538329 |
15 | 59362244596 |
16 | 289033801519 |
17 | 1401690320766 |
18 | 6773621702213 |
19 | 32630424771912 |
20 | 156746889564187 |
21 | 751052250017618 |
[2,20,140,863,4962,27313,145932,763031,3924694, 19928429,100145056,498967875,2468341930, 12136538329,59362244596,289033801519, 1401690320766,6773621702213,32630424771912, 156746889564187,751052250017618] |