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A026337
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a(n) = 4^n*(4^n - 1)/2.
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3
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0, 6, 120, 2016, 32640, 523776, 8386560, 134209536, 2147450880, 34359607296, 549755289600, 8796090925056, 140737479966720, 2251799780130816, 36028796884746240, 576460751766552576, 9223372034707292160, 147573952581086478336, 2361183241400462868480
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = 20*a(n-1) - 64*a(n-2).
G.f.: 6*x/((16*x-1)*(4*x-1)). (End)
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MAPLE
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MATHEMATICA
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Table[4^n (4^n-1)/2, {n, 0, 30}] (* or *) LinearRecurrence[{20, -64}, {0, 6}, 30] (* Harvey P. Dale, Nov 05 2023 *)
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PROG
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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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