n | a(n) |
---|---|
6 | 3 |
7 | 18 |
8 | 122 |
9 | 655 |
10 | 3240 |
11 | 14531 |
12 | 61520 |
13 | 247381 |
14 | 958434 |
15 | 3598594 |
16 | 13180348 |
17 | 47274577 |
18 | 166642096 |
19 | 578750970 |
20 | 1984671466 |
21 | 6731351834 |
22 | 22612409886 |
23 | 75321920403 |
24 | 249028297179 |
25 | 817867225710 |
26 | 2670093233760 |
27 | 8670380548402 |
[3,18,122,655,3240,14531,61520,247381,958434, 3598594,13180348,47274577,166642096,578750970, 1984671466,6731351834,22612409886,75321920403, 249028297179,817867225710,2670093233760, 8670380548402] |