n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 19 |
4 | 110 |
5 | 751 |
6 | 5902 |
7 | 52165 |
8 | 509588 |
9 | 5437729 |
10 | 62828306 |
11 | 780287839 |
12 | 10351912276 |
13 | 145944541159 |
14 | 2176931651546 |
15 | 34225419288421 |
16 | 565282627986368 |
17 | 9779830102138945 |
18 | 176776613812205074 |
19 | 3330780287838743575 |
[1,1,4,19,110,751,5902,52165,509588,5437729, 62828306,780287839,10351912276,145944541159, 2176931651546,34225419288421,565282627986368, 9779830102138945,176776613812205074, 3330780287838743575] |