n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 26 |
6 | 74 |
7 | 218 |
8 | 668 |
9 | 2116 |
10 | 6928 |
11 | 23254 |
12 | 79998 |
13 | 281694 |
14 | 1011956 |
15 | 3704900 |
16 | 13815692 |
17 | 52386978 |
18 | 201787950 |
19 | 789178950 |
20 | 3130824160 |
21 | 12589367840 |
22 | 51287685476 |
23 | 211557376938 |
24 | 883067740514 |
25 | 3728494418330 |
26 | 15916998678040 |
27 | 68672820917088 |
28 | 299331260431104 |
[1,1,2,4,10,26,74,218,668,2116,6928,23254,79998, 281694,1011956,3704900,13815692,52386978, 201787950,789178950,3130824160,12589367840, 51287685476,211557376938,883067740514, 3728494418330,15916998678040,68672820917088, 299331260431104] |