n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 10 |
4 | 40 |
5 | 138 |
6 | 551 |
7 | 2157 |
8 | 8810 |
9 | 36647 |
10 | 154078 |
11 | 661375 |
12 | 2854646 |
13 | 12490169 |
14 | 55043299 |
15 | 244367746 |
16 | 1093384878 |
17 | 4915059946 |
18 | 22237882646 |
19 | 101035126126 |
20 | 461173650726 |
21 | 2113656372476 |
22 | 9720476876090 |
23 | 44867012962344 |
24 | 207692597912237 |
25 | 964303906233908 |
26 | 4489064030758398 |
27 | 20948595168627176 |
[1,1,4,10,40,138,551,2157,8810,36647,154078, 661375,2854646,12490169,55043299,244367746, 1093384878,4915059946,22237882646,101035126126, 461173650726,2113656372476,9720476876090, 44867012962344,207692597912237,964303906233908, 4489064030758398,20948595168627176] |