n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 31 |
4 | 109 |
5 | 338 |
6 | 1029 |
7 | 2889 |
8 | 7797 |
9 | 19928 |
10 | 48965 |
11 | 115275 |
12 | 262034 |
13 | 574803 |
14 | 1222170 |
15 | 2521350 |
16 | 5060938 |
17 | 9896451 |
18 | 18891871 |
19 | 35249977 |
20 | 64390786 |
21 | 115284416 |
22 | 202560300 |
23 | 349637130 |
24 | 593499173 |
25 | 991625986 |
26 | 1632248998 |
27 | 2648936320 |
28 | 4241607523 |
29 | 6705867270 |
30 | 10474314965 |
[1,2,9,31,109,338,1029,2889,7797,19928,48965, 115275,262034,574803,1222170,2521350,5060938, 9896451,18891871,35249977,64390786,115284416, 202560300,349637130,593499173,991625986, 1632248998,2648936320,4241607523,6705867270, 10474314965] |