n | a(n) |
---|---|
1 | 4 |
2 | 54 |
3 | 420 |
4 | 3088 |
5 | 25226 |
6 | 239994 |
7 | 2338286 |
8 | 23240168 |
9 | 232006814 |
10 | 2352889414 |
11 | 24069853302 |
12 | 248560741574 |
13 | 2582277394354 |
14 | 26997628173380 |
15 | 283652378887212 |
16 | 2994183763030920 |
17 | 31727834772912212 |
18 | 337396544704648686 |
[4,54,420,3088,25226,239994,2338286,23240168, 232006814,2352889414,24069853302,248560741574, 2582277394354,26997628173380,283652378887212, 2994183763030920,31727834772912212, 337396544704648686] |