n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 22 |
3 | 136 |
4 | 868 |
5 | 5584 |
6 | 35992 |
7 | 232096 |
8 | 1496848 |
9 | 9653824 |
10 | 62262112 |
11 | 401558656 |
12 | 2589848128 |
13 | 16703198464 |
14 | 107727106432 |
15 | 694784866816 |
16 | 4481007870208 |
17 | 28900214293504 |
18 | 186391635645952 |
19 | 1202130942232576 |
20 | 7753131181401088 |
[1,4,22,136,868,5584,35992,232096,1496848,9653824, 62262112,401558656,2589848128,16703198464, 107727106432,694784866816,4481007870208, 28900214293504,186391635645952,1202130942232576, 7753131181401088] |