n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 10 |
4 | 40 |
5 | 129 |
6 | 549 |
7 | 1933 |
8 | 8502 |
9 | 31708 |
10 | 142109 |
11 | 549108 |
12 | 2494264 |
13 | 9891529 |
14 | 45352455 |
15 | 183421419 |
16 | 847068443 |
17 | 3478366440 |
18 | 16154265409 |
19 | 67150019188 |
20 | 313261541733 |
21 | 1315277095648 |
22 | 6158394389696 |
23 | 26075273852257 |
24 | 122461840619532 |
25 | 522243214701570 |
26 | 2459029674132398 |
27 | 10551608705702006 |
[1,1,4,10,40,129,549,1933,8502,31708,142109, 549108,2494264,9891529,45352455,183421419, 847068443,3478366440,16154265409,67150019188, 313261541733,1315277095648,6158394389696, 26075273852257,122461840619532,522243214701570, 2459029674132398,10551608705702006] |