n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 8 |
4 | 28 |
5 | 80 |
6 | 308 |
7 | 984 |
8 | 3980 |
9 | 13472 |
10 | 56164 |
11 | 197032 |
12 | 838396 |
13 | 3013872 |
14 | 13015188 |
15 | 47624568 |
16 | 207971436 |
17 | 771336512 |
18 | 3397886660 |
19 | 12736715592 |
20 | 56502898140 |
21 | 213618833808 |
22 | 953139545076 |
23 | 3629043226392 |
24 | 16270547827020 |
25 | 62317467147744 |
[1,1,4,8,28,80,308,984,3980,13472,56164,197032, 838396,3013872,13015188,47624568,207971436, 771336512,3397886660,12736715592,56502898140, 213618833808,953139545076,3629043226392, 16270547827020,62317467147744] |