n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 11 |
4 | 40 |
5 | 145 |
6 | 557 |
7 | 2204 |
8 | 8878 |
9 | 36670 |
10 | 153158 |
11 | 649421 |
12 | 2779083 |
13 | 12009927 |
14 | 52301065 |
15 | 229322103 |
16 | 1011602788 |
17 | 4485941698 |
18 | 19989047298 |
19 | 89445085086 |
20 | 401786301272 |
21 | 1811068535817 |
22 | 8189394966213 |
23 | 37138317913733 |
24 | 168865708226573 |
25 | 769695000793202 |
26 | 3516190063129191 |
27 | 16096483440690982 |
[1,1,4,11,40,145,557,2204,8878,36670,153158, 649421,2779083,12009927,52301065,229322103, 1011602788,4485941698,19989047298,89445085086, 401786301272,1811068535817,8189394966213, 37138317913733,168865708226573,769695000793202, 3516190063129191,16096483440690982] |