n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 20 |
3 | 104 |
4 | 544 |
5 | 2848 |
6 | 14912 |
7 | 78080 |
8 | 408832 |
9 | 2140672 |
10 | 11208704 |
11 | 58689536 |
12 | 307302400 |
13 | 1609056256 |
14 | 8425127936 |
15 | 44114542592 |
16 | 230986743808 |
17 | 1209462292480 |
18 | 6332826779648 |
19 | 33159111507968 |
20 | 173623361929216 |
21 | 909103725543424 |
22 | 4760128905543680 |
23 | 24924358531088384 |
24 | 130505635564355584 |
[1,4,20,104,544,2848,14912,78080,408832,2140672, 11208704,58689536,307302400,1609056256,8425127936, 44114542592,230986743808,1209462292480, 6332826779648,33159111507968,173623361929216, 909103725543424,4760128905543680, 24924358531088384,130505635564355584] |