n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 74 |
5 | 290 |
6 | 1196 |
7 | 5102 |
8 | 22418 |
9 | 100762 |
10 | 462184 |
11 | 2155896 |
12 | 10211440 |
13 | 49013520 |
14 | 238127606 |
15 | 1169523872 |
16 | 5801045062 |
17 | 29033594556 |
18 | 146509374164 |
19 | 744892740620 |
20 | 3813481756518 |
21 | 19647505270704 |
22 | 101820931159954 |
23 | 530537879440540 |
24 | 2778251007843926 |
[1,2,6,20,74,290,1196,5102,22418,100762,462184, 2155896,10211440,49013520,238127606,1169523872, 5801045062,29033594556,146509374164,744892740620, 3813481756518,19647505270704,101820931159954, 530537879440540,2778251007843926] |