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 A022368 Fibonacci sequence beginning 2, 12. 3
 2, 12, 14, 26, 40, 66, 106, 172, 278, 450, 728, 1178, 1906, 3084, 4990, 8074, 13064, 21138, 34202, 55340, 89542, 144882, 234424, 379306, 613730, 993036, 1606766, 2599802, 4206568, 6806370, 11012938 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 Tanya Khovanova, Recursive Sequences Index entries for linear recurrences with constant coefficients, signature (1,1). FORMULA G.f.: 2*(1+5*x)/(1-x-x^2). - Philippe Deléham, Nov 19 2008 a(n) = 2*A022096(n). - R. J. Mathar, Sep 27 2014 a(n) = 2*(Fibonacci(n+2) + 4*Fibonacci(n)). - G. C. Greubel, Aug 27 2017 MATHEMATICA a={}; b=2; c=12; AppendTo[a, b]; AppendTo[a, c]; Do[b=b+c; AppendTo[a, b]; c=b+c; AppendTo[a, c], {n, 4!}]; a (* Vladimir Joseph Stephan Orlovsky, Sep 18 2008 *) Table[2*(Fibonacci[n + 2] + 4*Fibonacci[n]), {n, 0, 50}] (* or *) LinearRecurrence[{1, 1}, {2, 12}, 50] (* G. C. Greubel, Aug 27 2017 *) PROG (PARI) for(n=0, 50, print1(2*(fibonacci(n+2) + 4*fibonacci(n)), ", ")) \\ G. C. Greubel, Aug 27 2017 CROSSREFS Sequence in context: A108976 A073598 A232768 * A076484 A259128 A280942 Adjacent sequences:  A022365 A022366 A022367 * A022369 A022370 A022371 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified August 18 07:39 EDT 2019. Contains 326075 sequences. (Running on oeis4.)