n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 20 |
4 | 39 |
5 | 175 |
6 | 779 |
7 | 1500 |
8 | 6664 |
9 | 29600 |
10 | 56979 |
11 | 253075 |
12 | 1124039 |
13 | 2163720 |
14 | 9610204 |
15 | 42683900 |
16 | 82164399 |
17 | 364934695 |
18 | 1620864179 |
19 | 3120083460 |
20 | 13857908224 |
21 | 61550154920 |
22 | 118481007099 |
23 | 526235577835 |
24 | 2337285022799 |
25 | 4499158186320 |
26 | 19983094049524 |
27 | 88755280711460 |
28 | 170849530073079 |
29 | 758831338304095 |
30 | 3370363382012699 |
[0,4,20,39,175,779,1500,6664,29600,56979,253075, 1124039,2163720,9610204,42683900,82164399, 364934695,1620864179,3120083460,13857908224, 61550154920,118481007099,526235577835, 2337285022799,4499158186320,19983094049524, 88755280711460,170849530073079,758831338304095, 3370363382012699] |