N
i
= 6N
i-1
- N
i-2
N
0
= 0, N
1
= 1
A
i
= 2A
i-1
+ A
i-2
A
0
= 1, A
1
= 1
M
i
= (A
i
)
2
- ((i+1) mod 2)
n
m