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A075876
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Values of n for which A075825(n)=1.
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0
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0, 2, 4, 12, 52, 212, 852, 3412, 13652, 54612, 218452, 873812, 3495252, 13981012
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OFFSET
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1,2
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COMMENTS
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For n > 4 it appears that a(n) = 4a(n-1) + 4.
By induction, we have for k >= 0:
In particular, this sequence contains b(k) = (10*4^k-4)/3 which is the solution of b(k) = 4*b(k-1)+4 with b(0) = 2.
The only terms <= 2*10^7 that are not of that form are 0 and 4. (End)
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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