n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 8 |
4 | 20 |
5 | 60 |
6 | 160 |
7 | 448 |
8 | 1216 |
9 | 3344 |
10 | 9120 |
11 | 24960 |
12 | 68160 |
13 | 186304 |
14 | 508928 |
15 | 1390592 |
16 | 3799040 |
17 | 10379520 |
18 | 28357120 |
19 | 77473792 |
20 | 211661824 |
21 | 578272256 |
22 | 1579868160 |
23 | 4316282880 |
24 | 11792302080 |
25 | 32217174016 |
26 | 88018952192 |
27 | 240472260608 |
[0,1,2,8,20,60,160,448,1216,3344,9120,24960,68160, 186304,508928,1390592,3799040,10379520,28357120, 77473792,211661824,578272256,1579868160, 4316282880,11792302080,32217174016,88018952192, 240472260608] |