n | a(n) |
---|---|
5 | 1 |
6 | 6 |
7 | 28 |
8 | 112 |
9 | 414 |
10 | 1452 |
11 | 4917 |
12 | 16236 |
13 | 52624 |
14 | 168168 |
15 | 531531 |
16 | 1665456 |
17 | 5182008 |
18 | 16031952 |
19 | 49366674 |
20 | 151419816 |
21 | 462919401 |
22 | 1411306358 |
23 | 4292487562 |
24 | 13029127584 |
25 | 39478598170 |
26 | 119439969220 |
27 | 360881425710 |
28 | 1089126806040 |
[1,6,28,112,414,1452,4917,16236,52624,168168, 531531,1665456,5182008,16031952,49366674, 151419816,462919401,1411306358,4292487562, 13029127584,39478598170,119439969220,360881425710, 1089126806040] |