n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 20 |
4 | 145 |
5 | 1441 |
6 | 18248 |
7 | 280392 |
8 | 5063361 |
9 | 105063361 |
10 | 2463011052 |
11 | 64380375276 |
12 | 1856540769313 |
13 | 58550453144609 |
14 | 2004745521503984 |
15 | 74062339559431920 |
16 | 2936485391069247713 |
17 | 124376016487663499489 |
18 | 5604762874272465685428 |
[1,4,20,145,1441,18248,280392,5063361,105063361, 2463011052,64380375276,1856540769313, 58550453144609,2004745521503984,74062339559431920, 2936485391069247713,124376016487663499489, 5604762874272465685428] |