n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 14 |
3 | 48 |
4 | 137 |
5 | 380 |
6 | 998 |
7 | 2488 |
8 | 5996 |
9 | 14020 |
10 | 31868 |
11 | 70616 |
12 | 153389 |
13 | 326248 |
14 | 681914 |
15 | 1402880 |
16 | 2841769 |
17 | 5678316 |
18 | 11201956 |
19 | 21833480 |
20 | 42081245 |
21 | 80264752 |
22 | 151572328 |
23 | 283577152 |
24 | 525894397 |
25 | 967100700 |
26 | 1764378830 |
27 | 3194682272 |
28 | 5742739237 |
29 | 10252117308 |
30 | 18182247316 |
[1,4,14,48,137,380,998,2488,5996,14020,31868, 70616,153389,326248,681914,1402880,2841769, 5678316,11201956,21833480,42081245,80264752, 151572328,283577152,525894397,967100700, 1764378830,3194682272,5742739237,10252117308, 18182247316] |