n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 30 |
4 | 230 |
5 | 1819 |
6 | 14466 |
7 | 114900 |
8 | 913187 |
9 | 7256380 |
10 | 57664692 |
11 | 458236178 |
12 | 3641435760 |
13 | 28937067889 |
14 | 229951848995 |
15 | 1827338913535 |
16 | 14521161884614 |
17 | 115394100670410 |
18 | 916992651769082 |
19 | 7286988782183320 |
20 | 57906904219355630 |
[1,4,30,230,1819,14466,114900,913187,7256380, 57664692,458236178,3641435760,28937067889, 229951848995,1827338913535,14521161884614, 115394100670410,916992651769082,7286988782183320, 57906904219355630] |