n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 19 |
4 | 109 |
5 | 742 |
6 | 5815 |
7 | 51193 |
8 | 498118 |
9 | 5296321 |
10 | 60987817 |
11 | 754940848 |
12 | 9983845261 |
13 | 140329768789 |
14 | 2087182244308 |
15 | 32725315072135 |
16 | 539118388883449 |
17 | 9304591246975030 |
18 | 167804098493079547 |
19 | 3155000165773280893 |
[1,1,4,19,109,742,5815,51193,498118,5296321, 60987817,754940848,9983845261,140329768789, 2087182244308,32725315072135,539118388883449, 9304591246975030,167804098493079547, 3155000165773280893] |