n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 2 |
4 | 3 |
5 | 11 |
6 | 23 |
7 | 76 |
8 | 188 |
9 | 575 |
10 | 1587 |
11 | 4732 |
12 | 13714 |
13 | 40993 |
14 | 121787 |
15 | 367100 |
16 | 1107371 |
17 | 3367412 |
18 | 10267404 |
19 | 31468401 |
20 | 96734992 |
21 | 298488537 |
22 | 923587457 |
23 | 2866241029 |
24 | 8916951360 |
25 | 27808418089 |
26 | 86910042122 |
27 | 272180834822 |
28 | 854004007736 |
29 | 2684311988984 |
30 | 8451232727631 |
[1,1,0,2,3,11,23,76,188,575,1587,4732,13714,40993, 121787,367100,1107371,3367412,10267404,31468401, 96734992,298488537,923587457,2866241029, 8916951360,27808418089,86910042122,272180834822, 854004007736,2684311988984,8451232727631] |