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A093146
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Third binomial transform of Pell(3n-1).
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1
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1, 5, 50, 750, 12500, 212500, 3625000, 61875000, 1056250000, 18031250000, 307812500000, 5254687500000, 89703125000000, 1531328125000000, 26141406250000000, 446261718750000000, 7618164062500000000
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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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G.f.: (1-15*x)/(1 - 20*x + 50*x^2);
a(n) = (10 + 5*sqrt(2))^n*(1/2 - sqrt(2)/4) + (10 - 5*sqrt(2))^n*(1/2 + sqrt(2)/4).
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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