n | a(n) |
---|---|
1 | 20 |
2 | 80 |
3 | 304 |
4 | 1144 |
5 | 4232 |
6 | 15536 |
7 | 56616 |
8 | 205400 |
9 | 742608 |
10 | 2678752 |
11 | 9648024 |
12 | 34716712 |
13 | 124861664 |
14 | 449008336 |
15 | 1614830152 |
16 | 5809328408 |
17 | 20907961552 |
18 | 75287770240 |
19 | 271263934328 |
20 | 977981837448 |
21 | 3528166785472 |
22 | 12736459731632 |
23 | 46007299834152 |
[20,80,304,1144,4232,15536,56616,205400,742608, 2678752,9648024,34716712,124861664,449008336, 1614830152,5809328408,20907961552,75287770240, 271263934328,977981837448,3528166785472, 12736459731632,46007299834152] |