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Search: id:A127211
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| 4, 48, 256, 1792, 11264, 73728, 475136, 3080192, 19922944, 128974848, 834666496, 5402263552, 34963718144, 226291089408, 1464583847936, 9478992822272, 61349312856064, 397061136580608, 2569833552019456, 16632312393367552
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OFFSET
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1,1
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FORMULA
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a(n) = Trace of matrix [({4,4},{4,0})^n] a(n) = 4^n Trace of matrix [({1,1},{1,0})^n]
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MATHEMATICA
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Table[4^n Tr[MatrixPower[{{1, 1}, {1, 0}}, x]], {x, 1, 20}]
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CROSSREFS
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Cf. A087131, A127210, A127212, A127213, A127214, A127215, A127216.
Sequence in context: A048608 A162673 A002287 this_sequence A129002 A144704 A091904
Adjacent sequences: A127208 A127209 A127210 this_sequence A127212 A127213 A127214
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Jan 09 2007
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