n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 14 |
5 | 48 |
6 | 152 |
7 | 476 |
8 | 1425 |
9 | 4340 |
10 | 13288 |
11 | 40852 |
12 | 125124 |
13 | 382888 |
14 | 1171612 |
15 | 3587505 |
16 | 10985790 |
17 | 33638142 |
18 | 102988410 |
19 | 315318756 |
20 | 965432832 |
21 | 2955964296 |
22 | 9050522241 |
23 | 27710613432 |
24 | 84843476928 |
25 | 259771465608 |
26 | 795361704776 |
27 | 2435217884992 |
[0,1,2,6,14,48,152,476,1425,4340,13288,40852, 125124,382888,1171612,3587505,10985790,33638142, 102988410,315318756,965432832,2955964296, 9050522241,27710613432,84843476928,259771465608, 795361704776,2435217884992] |