n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 21 |
6 | 51 |
7 | 127 |
8 | 323 |
9 | 835 |
10 | 2188 |
11 | 5798 |
12 | 15511 |
13 | 41835 |
14 | 113633 |
15 | 310557 |
16 | 853333 |
17 | 2355861 |
18 | 6531062 |
19 | 18171848 |
20 | 50722229 |
21 | 141973073 |
22 | 398351055 |
23 | 1120056347 |
24 | 3155043447 |
25 | 8901325751 |
26 | 25147423616 |
27 | 71127785002 |
28 | 201381834019 |
29 | 570655858439 |
30 | 1618256772285 |
[1,1,2,4,9,21,51,127,323,835,2188,5798,15511, 41835,113633,310557,853333,2355861,6531062, 18171848,50722229,141973073,398351055,1120056347, 3155043447,8901325751,25147423616,71127785002, 201381834019,570655858439,1618256772285] |