n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 7 |
4 | 28 |
5 | 58 |
6 | 232 |
7 | 523 |
8 | 2092 |
9 | 4966 |
10 | 19864 |
11 | 48838 |
12 | 195352 |
13 | 492724 |
14 | 1970896 |
15 | 5068915 |
16 | 20275660 |
17 | 52955950 |
18 | 211823800 |
19 | 560198962 |
20 | 2240795848 |
21 | 5987822380 |
22 | 23951289520 |
23 | 64563867454 |
24 | 258255469816 |
25 | 701383563388 |
26 | 2805534253552 |
[1,1,4,7,28,58,232,523,2092,4966,19864,48838, 195352,492724,1970896,5068915,20275660,52955950, 211823800,560198962,2240795848,5987822380, 23951289520,64563867454,258255469816,701383563388, 2805534253552] |