n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 14 |
5 | 40 |
6 | 159 |
7 | 812 |
8 | 5133 |
9 | 42942 |
10 | 474619 |
11 | 6708142 |
12 | 121367878 |
13 | 2819170132 |
14 | 83571532538 |
15 | 3148951107867 |
16 | 151069353323782 |
17 | 9219463980803329 |
18 | 714951048370178409 |
19 | 70448496563603216429 |
20 | 8818161368662624534857 |
[1,1,2,5,14,40,159,812,5133,42942,474619,6708142, 121367878,2819170132,83571532538,3148951107867, 151069353323782,9219463980803329, 714951048370178409,70448496563603216429, 8818161368662624534857] |