n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 10 |
4 | 38 |
5 | 122 |
6 | 488 |
7 | 1710 |
8 | 7087 |
9 | 26321 |
10 | 111541 |
11 | 429981 |
12 | 1852992 |
13 | 7337801 |
14 | 32021180 |
15 | 129408800 |
16 | 570358802 |
17 | 2341953471 |
18 | 10405274367 |
19 | 43277165242 |
20 | 193563780133 |
21 | 813625097670 |
22 | 3659544514239 |
23 | 15519836602737 |
24 | 70141510450253 |
25 | 299727234321282 |
26 | 1360257096588248 |
27 | 5850780618278814 |
[1,1,4,10,38,122,488,1710,7087,26321,111541, 429981,1852992,7337801,32021180,129408800, 570358802,2341953471,10405274367,43277165242, 193563780133,813625097670,3659544514239, 15519836602737,70141510450253,299727234321282, 1360257096588248,5850780618278814] |