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A173141
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a(n) = 49*n^2 + n.
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2
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50, 198, 444, 788, 1230, 1770, 2408, 3144, 3978, 4910, 5940, 7068, 8294, 9618, 11040, 12560, 14178, 15894, 17708, 19620, 21630, 23738, 25944, 28248, 30650, 33150, 35748, 38444, 41238, 44130, 47120, 50208, 53394, 56678, 60060, 63540, 67118, 70794, 74568, 78440, 82410, 86478, 90644, 94908, 99270, 103730, 108288
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OFFSET
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1,1
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COMMENTS
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The identity (98*n+1)^2-(49*n^2+n)*(14)^2 = 1 can be written as A157947(n)^2-a(n)*14^2 = 1. - Vincenzo Librandi, Feb 10 2012
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LINKS
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FORMULA
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MATHEMATICA
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LinearRecurrence[{3, -3, 1}, {50, 198, 444}, 50] (* Vincenzo Librandi, Feb 10 2012 *)
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PROG
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(Magma) [ 49*n^2+n: n in [1..50] ];
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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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