n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 4 |
6 | 6 |
7 | 4 |
8 | 14 |
9 | 60 |
10 | 90 |
11 | 216 |
12 | 630 |
13 | 1496 |
14 | 3382 |
15 | 9144 |
16 | 22952 |
17 | 57168 |
18 | 147708 |
19 | 386212 |
20 | 997816 |
21 | 2608600 |
22 | 6894104 |
23 | 18203272 |
24 | 48193590 |
25 | 128294936 |
26 | 342193010 |
27 | 913922604 |
28 | 2447360528 |
29 | 6566442000 |
30 | 17642534388 |
31 | 47481137536 |
[0,0,4,6,4,14,60,90,216,630,1496,3382,9144,22952, 57168,147708,386212,997816,2608600,6894104, 18203272,48193590,128294936,342193010,913922604, 2447360528,6566442000,17642534388,47481137536] |