n | a(n) |
---|---|
4 | 1 |
5 | 5 |
6 | 18 |
7 | 57 |
8 | 168 |
9 | 472 |
10 | 1280 |
11 | 3376 |
12 | 8704 |
13 | 22016 |
14 | 54784 |
15 | 134400 |
16 | 325632 |
17 | 780288 |
18 | 1851392 |
19 | 4354048 |
20 | 10158080 |
21 | 23527424 |
22 | 54132736 |
23 | 123797504 |
24 | 281542656 |
25 | 637009920 |
26 | 1434451968 |
27 | 3215982592 |
28 | 7180648448 |
29 | 15971909632 |
30 | 35399925760 |
31 | 78198603776 |
32 | 172201345024 |
[1,5,18,57,168,472,1280,3376,8704,22016,54784, 134400,325632,780288,1851392,4354048,10158080, 23527424,54132736,123797504,281542656,637009920, 1434451968,3215982592,7180648448,15971909632, 35399925760,78198603776,172201345024] |