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A083421
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a(n)=2*5^n-2^n.
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2
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1, 8, 46, 242, 1234, 6218, 31186, 156122, 780994, 3905738, 19530226, 97654202, 488277154, 2441398058, 12207014866, 61035123482, 305175715714, 1525878775178, 7629394269106, 38146972131962, 190734862232674
(list; graph; refs; listen; history; internal format)
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