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3, 6, 3, 3, 9, 6, 3, 12, 9, 3, 15, 12, 3, 18, 15, 3, 21, 18, 3, 24, 21, 3, 27, 24, 3, 30, 27, 3, 33, 30, 3, 36, 33, 3, 39, 36, 3, 42, 39, 3, 45, 42, 3, 48, 45, 3, 51, 48, 3, 54, 51, 3, 57, 54, 3, 60, 57, 3, 63, 60, 3, 66, 63, 3, 69, 66, 3, 72, 69
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OFFSET
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1,1
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COMMENTS
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Same recurrence as in A046699 but with different starting values.
This sequence is quasilinear.
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LINKS
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FORMULA
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a(3n) = 3n, a(3n+1) = 3, a(3n+2) = 3n+6.
a(n) = 2*a(n-3) - a(n-6) for n>6.
G.f.: -(3*x^4 +3*x^3 -3*x^2 -6*x-3)/((x-1)^2*(x^2+x+1)^2).
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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