n | a(n) |
---|---|
4 | 1 |
5 | 1 |
6 | 2 |
7 | 6 |
8 | 17 |
9 | 73 |
10 | 389 |
11 | 2274 |
12 | 14502 |
13 | 97033 |
14 | 672781 |
15 | 4792530 |
16 | 34911786 |
17 | 259106122 |
18 | 1954315346 |
19 | 14949368524 |
20 | 115784496932 |
21 | 906736988527 |
22 | 7171613842488 |
23 | 57231089062625 |
24 | 460428456484557 |
25 | 3731572377382341 |
26 | 30447133566946517 |
27 | 249968326771680542 |
28 | 2063931874299323140 |
[1,1,2,6,17,73,389,2274,14502,97033,672781, 4792530,34911786,259106122,1954315346,14949368524, 115784496932,906736988527,7171613842488, 57231089062625,460428456484557,3731572377382341, 30447133566946517,249968326771680542, 2063931874299323140] |