| def A(n): | |
| if n == 1: | |
| return 1 | |
| elif n == 2: | |
| return 4 | |
| else: | |
| return A(n-1) + 2*A(n-2) |
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| def A(n): | |
| if n == 1: | |
| return 1 | |
| elif n == 2: | |
| return 4 | |
| else: | |
| return A(n-1) + 2*A(n-2) |