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A162766
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a(n) = 3*a(n-2) for n > 2; a(1) = 4, a(2) = 3.
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9
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4, 3, 12, 9, 36, 27, 108, 81, 324, 243, 972, 729, 2916, 2187, 8748, 6561, 26244, 19683, 78732, 59049, 236196, 177147, 708588, 531441, 2125764, 1594323, 6377292, 4782969, 19131876, 14348907, 57395628, 43046721, 172186884, 129140163
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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a(n) = (5-3*(-1)^n)*3^(1/4*(2*n-1+(-1)^n))/2.
G.f.: x*(4+3*x)/(1-3*x^2).
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PROG
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(Magma) [ n le 2 select 5-n else 3*Self(n-2): n in [1..34] ];
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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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