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A169650
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a(1) = 3; thereafter a(n) = 3*a(n-1)+2^n-6.
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2
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3, 7, 23, 79, 263, 847, 2663, 8239, 25223, 76687, 232103, 700399, 2109383, 6344527, 19066343, 57264559, 171924743, 516036367, 1548633383, 4646948719, 13942943303, 41833024207, 125507461223, 376539160879, 1129651037063, 3389020220047, 10167194877863
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OFFSET
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1,1
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LINKS
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FORMULA
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MAPLE
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a:=n->if n=1 then 3 else 3*a(n-1)+2^n-6; fi;
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MATHEMATICA
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a[n_Integer/; n>=1]:=4*3^(n-1)-2^(n+1)+3 (* Todd Silvestri, Dec 15 2014 *)
RecurrenceTable[{a[1]==3, a[n]==3a[n-1]+2^n-6}, a, {n, 30}] (* Harvey P. Dale, Jan 22 2018 *)
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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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