n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 8 |
6 | 20 |
7 | 57 |
8 | 171 |
9 | 548 |
10 | 1894 |
11 | 6998 |
12 | 27368 |
13 | 112653 |
14 | 486645 |
15 | 2201162 |
16 | 10397944 |
17 | 51161168 |
18 | 261571460 |
19 | 1386846249 |
20 | 7612315023 |
21 | 43190917004 |
22 | 252951090586 |
23 | 1527112817054 |
24 | 9492126182336 |
25 | 60677428545165 |
26 | 398489257136529 |
27 | 2686088269505042 |
28 | 18567557376240748 |
[1,1,1,2,4,8,20,57,171,548,1894,6998,27368,112653, 486645,2201162,10397944,51161168,261571460, 1386846249,7612315023,43190917004,252951090586, 1527112817054,9492126182336,60677428545165, 398489257136529,2686088269505042, 18567557376240748] |