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A199213
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a(n) = (3*5^n+1)/2.
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2
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2, 8, 38, 188, 938, 4688, 23438, 117188, 585938, 2929688, 14648438, 73242188, 366210938, 1831054688, 9155273438, 45776367188, 228881835938, 1144409179688, 5722045898438, 28610229492188, 143051147460938, 715255737304688
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 5*a(n-1)-2.
a(n) = 6*a(n-1)-5*a(n-2).
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PROG
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(Magma) [(3*5^n+1)/2: n in [0..30]];
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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