n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 11 |
4 | 40 |
5 | 172 |
6 | 820 |
7 | 4227 |
8 | 23336 |
9 | 137282 |
10 | 857178 |
11 | 5659496 |
12 | 39372213 |
13 | 287657495 |
14 | 2200586044 |
15 | 17579891124 |
16 | 146309132849 |
17 | 1265828289411 |
18 | 11362930635404 |
[1,2,4,11,40,172,820,4227,23336,137282,857178, 5659496,39372213,287657495,2200586044,17579891124, 146309132849,1265828289411,11362930635404] |