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Search: id:A127214
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| 2, 12, 56, 176, 672, 2496, 9088, 33536, 123392, 453632, 1669120, 6139904, 22585344, 83083264, 305627136, 1124270080, 4135714816, 15213527040, 55964073984, 205867974656
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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 [({2,2,2},{2,0,0}m{0,2,0)^n] a(n) = 2^n Trace of matrix [({1,1,1},{1,0,0},0,1,0)^n]
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MATHEMATICA
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Table[Tr[MatrixPower[2*{{1, 1, 1}, {1, 0, 0}, {0, 1, 0}}, x]], {x, 1, 20}]
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CROSSREFS
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Cf. A087131, A127210, A127211, A127212, A127213, A127215, A127216.
Sequence in context: A122676 A038175 A025171 this_sequence A124723 A122229 A127216
Adjacent sequences: A127211 A127212 A127213 this_sequence A127215 A127216 A127217
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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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