n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 4 |
4 | 16 |
5 | 64 |
6 | 196 |
7 | 676 |
8 | 2304 |
9 | 7744 |
10 | 26244 |
11 | 88804 |
12 | 300304 |
13 | 1016064 |
14 | 3437316 |
15 | 11628100 |
16 | 39337984 |
17 | 133079296 |
18 | 450203524 |
19 | 1523028676 |
20 | 5152368400 |
21 | 17430336576 |
22 | 58966408900 |
23 | 199481929956 |
24 | 674842534144 |
25 | 2282975946304 |
26 | 7723252297476 |
[0,4,4,16,64,196,676,2304,7744,26244,88804,300304, 1016064,3437316,11628100,39337984,133079296, 450203524,1523028676,5152368400,17430336576, 58966408900,199481929956,674842534144, 2282975946304,7723252297476] |