n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 7 |
5 | 27 |
6 | 167 |
7 | 1451 |
8 | 12672 |
9 | 133356 |
10 | 1573608 |
11 | 20731512 |
12 | 299642958 |
13 | 4732486932 |
14 | 81201040470 |
15 | 1500094187292 |
16 | 29730606352920 |
17 | 628968809015766 |
18 | 14147458062941100 |
19 | 337143091156288002 |
20 | 8485143902146640124 |
[1,1,1,7,27,167,1451,12672,133356,1573608, 20731512,299642958,4732486932,81201040470, 1500094187292,29730606352920,628968809015766, 14147458062941100,337143091156288002, 8485143902146640124] |