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Search: id:A115106
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| A115106 |
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Let M0 = {{2, 2, 0}, {1, 0, 1}, {0, 2, 2}}; M1 = {{1, 0, 1}, {2, 2, 0}, {0, 2, 2}}; M2 = {{2, 2, 0}, {0, 2, 2}, {1, 0, 1}}; M[n_] := M[n] = If[Mod[v[n][[1]], 3] == 0, M1, If[Mod[v[n][[2]], 3] == 0, M0, M2]] v[0] = {1, 1, 1}; M[0] = {{2, 2, 0}, {1, 0, 1}, {0, 2, 2}}; v[n_] := v[n] = M[n - 1].v[n - 1]. Then a(n) =v[n][[1]] |
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+0
1
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| 1, 4, 12, 20, 136, 392, 1408, 4544, 15040, 48896, 159232, 516608, 1675264, 5427200, 17575936, 56901632, 184188928, 596148224, 1929379840, 6244007936, 20206845952, 65392345088, 211617316864, 684814499840, 2216119238656
(list; graph; listen)
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OFFSET
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0,2
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MATHEMATICA
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M0 = {{2, 2, 0}, {1, 0, 1}, {0, 2, 2}}; M1 = {{1, 0, 1}, {2, 2, 0}, {0, 2, 2}}; M2 = {{2, 2, 0}, {0, 2, 2}, {1, 0, 1}}; M[n_] := M[n] = If[Mod[v[n][[1]], 3] == 0, M1, If[Mod[v[n][[2]], 3] == 0, M0, M2]] v[0] = {1, 1, 1}; M[0] = {{2, 2, 0}, {1, 0, 1}, {0, 2, 2}}; v[n_] := v[n] = M[n - 1].v[n - 1] a0 = Table[v[n][[1]], {n, 0, 25}]
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CROSSREFS
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Sequence in context: A008092 A087080 A134253 this_sequence A047965 A038430 A008167
Adjacent sequences: A115103 A115104 A115105 this_sequence A115107 A115108 A115109
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KEYWORD
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nonn
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Mar 03 2006
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