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A112685
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a(n)=5a(n-2)+2a(n-3).
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2
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1, 1, 1, 7, 7, 37, 49, 199, 319, 1093, 1993, 6103, 12151, 34501, 72961, 196807, 433807, 1129957, 2562649, 6517399, 15073159, 37712293, 88400593, 218707783, 517427551, 1270340101, 3024553321, 7386555607, 17663446807, 42981884677, 103090345249
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OFFSET
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0,4
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COMMENTS
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Last digit has period 12.
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LINKS
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FORMULA
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Differences: 0, 0, 6, 0, 30, 12, 150, 120, 774 ... = 6*A135138.
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MATHEMATICA
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nxt[{a_, b_, c_}]:={b, c, 5b+2a}; NestList[nxt, {1, 1, 1}, 30][[;; , 1]] (* or *) LinearRecurrence[{0, 5, 2}, {1, 1, 1}, 40] (* Harvey P. Dale, Dec 15 2023 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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