a(n) = 10*a(n-2)-16*a(n-4) for n>3, a(0)=1, a(1)=5, a(2)=14, a(3)=34. 1, 5, 14, 34, 124, 260, 1016, 2056, 8176, 16400, 65504, 131104, 524224, 1048640
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