n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 6 |
4 | 16 |
5 | 49 |
6 | 124 |
7 | 384 |
8 | 1041 |
9 | 2868 |
10 | 8189 |
11 | 22760 |
12 | 63910 |
13 | 179095 |
14 | 500979 |
15 | 1405340 |
16 | 3935526 |
17 | 11024880 |
18 | 30892270 |
19 | 86537090 |
20 | 242454683 |
21 | 679254490 |
22 | 1902958308 |
23 | 5331384633 |
24 | 14936238820 |
25 | 41845207329 |
26 | 117233159460 |
27 | 328438385380 |
[0,4,6,16,49,124,384,1041,2868,8189,22760,63910, 179095,500979,1405340,3935526,11024880,30892270, 86537090,242454683,679254490,1902958308, 5331384633,14936238820,41845207329,117233159460, 328438385380] |