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Search: id:A152120
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| A152120 |
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A product sequence: a(n)=2^n*Product[2 + 3*Cos[k*Pi/n]^2, {k, 1, (n - 1)/2}]. |
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+0
1
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| 1, 2, 4, 22, 56, 290, 748, 3862, 9968, 51458, 132820, 685654, 1769768, 9136034, 23581372, 121733590, 314211296, 1622045954, 4186725796, 21613041046, 55786259480, 287984161058, 743327100556, 3837260885398, 9904503072464
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OFFSET
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0,2
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FORMULA
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a(n)=2^n*Product[2 + 3*Cos[k*Pi/n]^2, {k, 1, (n - 1)/2}].
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MATHEMATICA
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a = Table[2^n*Product[2 + 3*Cos[k*Pi/n]^2, {k, 1, (n - 1)/2}], {n, 0, 30}]; Round[%] FullSimplify[ExpandAll[a]]
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CROSSREFS
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Sequence in context: A151809 A151801 A067654 this_sequence A072355 A134246 A071298
Adjacent sequences: A152117 A152118 A152119 this_sequence A152121 A152122 A152123
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KEYWORD
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nonn
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AUTHOR
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Roger L. Bagula and Gary W. Adamson (rlbagulatftn(AT)yahoo.com), Nov 24 2008
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