n | a(n) |
---|---|
1 | 20 |
2 | 84 |
3 | 376 |
4 | 1708 |
5 | 7784 |
6 | 35500 |
7 | 161928 |
8 | 738636 |
9 | 3369320 |
10 | 15369324 |
11 | 70107976 |
12 | 319801228 |
13 | 1458790184 |
14 | 6654348460 |
15 | 30354161928 |
16 | 138462112716 |
17 | 631602239720 |
18 | 2881086973164 |
19 | 13142230386376 |
20 | 59948977985548 |
21 | 273460429154984 |
[20,84,376,1708,7784,35500,161928,738636,3369320, 15369324,70107976,319801228,1458790184,6654348460, 30354161928,138462112716,631602239720, 2881086973164,13142230386376,59948977985548, 273460429154984] |