n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 16 |
5 | 48 |
6 | 140 |
7 | 424 |
8 | 1280 |
9 | 3920 |
10 | 12032 |
11 | 37184 |
12 | 115248 |
13 | 358624 |
14 | 1118784 |
15 | 3499584 |
16 | 10969344 |
17 | 34450944 |
18 | 108377984 |
19 | 341465344 |
20 | 1077300224 |
21 | 3403006464 |
22 | 10761447424 |
23 | 34065967104 |
24 | 107937899264 |
25 | 342293526016 |
26 | 1086339120128 |
27 | 3450236511232 |
28 | 10965437349888 |
[1,1,2,6,16,48,140,424,1280,3920,12032,37184, 115248,358624,1118784,3499584,10969344,34450944, 108377984,341465344,1077300224,3403006464, 10761447424,34065967104,107937899264,342293526016, 1086339120128,3450236511232,10965437349888] |