n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 19 |
4 | 100 |
5 | 562 |
6 | 3304 |
7 | 20071 |
8 | 124996 |
9 | 793774 |
10 | 5120632 |
11 | 33463102 |
12 | 221060008 |
13 | 1473830308 |
14 | 9904186192 |
15 | 67015401391 |
16 | 456192667396 |
17 | 3122028222934 |
18 | 21467769499864 |
19 | 148246598341018 |
20 | 1027656663676600 |
21 | 7148588698592956 |
22 | 49884553176689584 |
[1,1,4,19,100,562,3304,20071,124996,793774, 5120632,33463102,221060008,1473830308,9904186192, 67015401391,456192667396,3122028222934, 21467769499864,148246598341018,1027656663676600, 7148588698592956,49884553176689584] |