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A195464
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a(n) = 2^(4*n + 3) + 2*4^n + 3.
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1
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13, 139, 2083, 32899, 524803, 8390659, 134225923, 2147516419, 34359869443, 549756338179, 8796095119363, 140737496743939, 2251799847239683, 36028797153181699, 576460752840294403, 9223372039002259459, 147573952598266347523, 2361183241469182345219
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OFFSET
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0,1
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COMMENTS
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Binary numbers of form 1j1i11 where j and i are the number of 0's, n is the index, i = 2*n+1, j = 2*n+3.
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LINKS
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FORMULA
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a(n+2) = 20*a(n+1) - 64*a(n) + 135.
G.f.: (-13 + 134*x - 256*x^2)/(-1 + 21*x - 84*x^2 + 64*x^3). (End)
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EXAMPLE
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Terms starting from n=1 written in binary are 10001011, 100000100011, 1000000010000011, 10000000001000000011.
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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