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A210680
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a(n) = (3*a(n-1)) XOR a(n-2).
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1
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0, 1, 3, 8, 27, 89, 272, 873, 2859, 8936, 25491, 67665, 228192, 752241, 2167859, 6833896, 18464907, 52758345, 142005584, 440498361, 1186119547, 3461957320, 9357060899, 26968655777, 72945663424, 226371206881, 613739200867, 1752444795592, 4702791627067, 14623717009785
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = (3*a(n-1)) XOR a(n-2), a(0)=0, a(1)=1.
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MATHEMATICA
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RecurrenceTable[{a[0]==0, a[1]==1, a[n]==BitXor[3a[n-1], a[n-2]]}, a, {n, 30}] (* Harvey P. Dale, Nov 27 2014 *)
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CROSSREFS
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Cf. A168081: a(n) = (2*a(n-1)) XOR a(n-2), a(0)=0, a(1)=1.
Cf. A101624: a(n) = (2*a(n-2)) XOR a(n-1), a(0)=0, a(1)=1.
Cf. A204771: a(n) = (3*a(n-2)) XOR a(n-1), a(0)=0, a(1)=1.
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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