n | a(n) |
---|---|
5 | 1 |
6 | 9 |
7 | 56 |
8 | 300 |
9 | 1485 |
10 | 7007 |
11 | 32032 |
12 | 143208 |
13 | 629850 |
14 | 2735810 |
15 | 11767536 |
16 | 50220040 |
17 | 212952285 |
18 | 898198875 |
19 | 3771484800 |
20 | 15775723920 |
21 | 65770848990 |
22 | 273420862110 |
23 | 1133802618000 |
24 | 4691140763400 |
25 | 19371432850770 |
26 | 79850555673174 |
[1,9,56,300,1485,7007,32032,143208,629850,2735810, 11767536,50220040,212952285,898198875,3771484800, 15775723920,65770848990,273420862110, 1133802618000,4691140763400,19371432850770, 79850555673174] |