n | a(n) |
---|---|
2 | 2 |
3 | 18 |
4 | 133 |
5 | 873 |
6 | 5182 |
7 | 27786 |
8 | 135370 |
9 | 602454 |
10 | 2466628 |
11 | 9358497 |
12 | 33134431 |
13 | 110184932 |
14 | 346141949 |
15 | 1032550097 |
16 | 2938104492 |
17 | 8006865684 |
18 | 20971632456 |
19 | 52958252851 |
20 | 129291697111 |
21 | 305924724070 |
22 | 703108665327 |
23 | 1572722761341 |
[2,18,133,873,5182,27786,135370,602454,2466628, 9358497,33134431,110184932,346141949,1032550097, 2938104492,8006865684,20971632456,52958252851, 129291697111,305924724070,703108665327, 1572722761341] |