n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 23 |
4 | 220 |
5 | 3016 |
6 | 55011 |
7 | 1265824 |
8 | 35496711 |
9 | 1183686987 |
10 | 46072834777 |
11 | 2062557088117 |
12 | 104926356851165 |
13 | 6004962409831577 |
14 | 383331023991407286 |
15 | 27094756978689827593 |
16 | 2107021273883402908850 |
17 | 179261681391054814324774 |
18 | 16602830645109035036038335 |
[1,1,4,23,220,3016,55011,1265824,35496711, 1183686987,46072834777,2062557088117, 104926356851165,6004962409831577, 383331023991407286,27094756978689827593, 2107021273883402908850,179261681391054814324774, 16602830645109035036038335] |