n | a(n) |
---|---|
4 | 1 |
5 | 9 |
6 | 54 |
7 | 273 |
8 | 1260 |
9 | 5508 |
10 | 23256 |
11 | 95931 |
12 | 389367 |
13 | 1562275 |
14 | 6216210 |
15 | 24582285 |
16 | 96768360 |
17 | 379629720 |
18 | 1485507600 |
19 | 5801732460 |
20 | 22626756594 |
21 | 88152205554 |
22 | 343176898988 |
23 | 1335293573130 |
24 | 5193831553416 |
25 | 20198233818840 |
26 | 78542105700240 |
27 | 305417807763705 |
[1,9,54,273,1260,5508,23256,95931,389367,1562275, 6216210,24582285,96768360,379629720,1485507600, 5801732460,22626756594,88152205554,343176898988, 1335293573130,5193831553416,20198233818840, 78542105700240,305417807763705] |