n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 6 |
6 | 16 |
7 | 54 |
8 | 154 |
9 | 480 |
10 | 1418 |
11 | 4302 |
12 | 12836 |
13 | 38670 |
14 | 115802 |
15 | 347868 |
16 | 1042970 |
17 | 3130350 |
18 | 9389152 |
19 | 28171710 |
20 | 84509410 |
21 | 253541136 |
22 | 760606270 |
23 | 2281857318 |
24 | 6845520448 |
25 | 20536677354 |
26 | 61609877590 |
27 | 184829980176 |
28 | 554489476858 |
29 | 1663469474178 |
30 | 4990407031696 |
[0,0,0,2,6,16,54,154,480,1418,4302,12836,38670, 115802,347868,1042970,3130350,9389152,28171710, 84509410,253541136,760606270,2281857318, 6845520448,20536677354,61609877590,184829980176, 554489476858,1663469474178,4990407031696] |