n | a(n) |
---|---|
1 | 4 |
2 | 40 |
3 | 240 |
4 | 1088 |
5 | 4160 |
6 | 14208 |
7 | 44800 |
8 | 133120 |
9 | 377856 |
10 | 1034240 |
11 | 2748416 |
12 | 7127040 |
13 | 18104320 |
14 | 45187072 |
15 | 111083520 |
16 | 269484032 |
17 | 646184960 |
18 | 1533542400 |
19 | 3606052864 |
20 | 8409579520 |
21 | 19465764864 |
22 | 44753223680 |
23 | 102257131520 |
24 | 232330887168 |
[4,40,240,1088,4160,14208,44800,133120,377856, 1034240,2748416,7127040,18104320,45187072, 111083520,269484032,646184960,1533542400, 3606052864,8409579520,19465764864,44753223680, 102257131520,232330887168] |