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 A099754 a(n) = (3^n +1)/2 + 2^n. 4
 2, 4, 9, 22, 57, 154, 429, 1222, 3537, 10354, 30549, 90622, 269817, 805354, 2407869, 7207222, 21588897, 64701154, 193972389, 581655022, 1744440777, 5232273754, 15694724109, 47079978022, 141231545457, 423677859154, 1271000023029 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Let b(0)=1, b(n) = A005578(n-1) = {1,1,2,3,6,11,22,43,86,171,342, ...} then a(n) = Sum_{k=0..n+1} C(n+1,k)*b(k). Binomial transform of A135351. - R. J. Mathar, Aug 05 2009 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 Yilmaz Simsek, New families of special numbers for computing negative order Euler numbers, arXiv:1604.05601 [math.NT], 2016. Index entries for linear recurrences with constant coefficients, signature (6,-11,6). FORMULA a(n) = (3^n + 2^(n+1) + 1)/2. G.f.: (2-8*x+7*x^2)/((1-x)*(1-2*x)*(1-3*x)). - Jaume Oliver Lafont, Mar 06 2009 a(n) = A007051(n) + A000079(n). - Michel Marcus, Aug 15 2013 E.g.f.: (exp(x) + 2*exp(2*x) + exp(3*x))/2. - G. C. Greubel, Sep 03 2019 EXAMPLE a(6) = (3^6+1)/2 + 2^6 = 365+64 = 429. a(6) = 1 + 7*1 + 21*1 + 35*2 + 35*3 + 21*6 + 7*11 + 1*22 = 429. MAPLE seq((3^n +2^(n+1) +1)/2, n=0..30); # G. C. Greubel, Sep 03 2019 MATHEMATICA Table[(3^n +2^(n+1) +1)/2, {n, 0, 30}] (* G. C. Greubel, Sep 03 2019 *) PROG (PARI) a(n) = (3^n+1)/2 + 2^n; \\ Michel Marcus, Aug 15 2013 (MAGMA) [(3^n +2^(n+1) +1)/2: n in [0..30]]; // G. C. Greubel, Sep 03 2019 (Sage) [(3^n +2^(n+1) +1)/2 for n in (0..30)] # G. C. Greubel, Sep 03 2019 (GAP) List([0..30], n-> (3^n +2^(n+1) +1)/2); # G. C. Greubel, Sep 03 2019 CROSSREFS Cf. A005578. Sequence in context: A301362 A130018 A322504 * A105633 A287709 A196161 Adjacent sequences:  A099751 A099752 A099753 * A099755 A099756 A099757 KEYWORD easy,nonn AUTHOR Miklos Kristof, Nov 11 2004 EXTENSIONS Corrected and extended by T. D. Noe, Nov 07 2006 STATUS approved

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Last modified September 24 07:28 EDT 2020. Contains 337317 sequences. (Running on oeis4.)