n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 16 |
3 | 56 |
4 | 176 |
5 | 520 |
6 | 1456 |
7 | 3896 |
8 | 10048 |
9 | 25100 |
10 | 60960 |
11 | 144440 |
12 | 334752 |
13 | 760456 |
14 | 1696464 |
15 | 3722224 |
16 | 8043040 |
17 | 17135624 |
18 | 36031104 |
19 | 74840568 |
20 | 153680928 |
21 | 312198160 |
22 | 627828272 |
23 | 1250540024 |
24 | 2468443296 |
25 | 4830809868 |
26 | 9377190336 |
27 | 18061370288 |
28 | 34531009760 |
29 | 65552873736 |
[1,4,16,56,176,520,1456,3896,10048,25100,60960, 144440,334752,760456,1696464,3722224,8043040, 17135624,36031104,74840568,153680928,312198160, 627828272,1250540024,2468443296,4830809868, 9377190336,18061370288,34531009760,65552873736] |