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 A255176 a(n) = H_n(2,2) where H_n is the n-th hyperoperator. 4
 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS See A054871 for definitions and key links. Also, decimal expansion of 31/90. - Bruno Berselli, Mar 18 2015 Essentially the same as A010709, A040002, A113311, A123932, and A151798. - R. J. Mathar, Mar 20 2015 LINKS Wikipedia, Hyperoperation. Index entries for linear recurrences with constant coefficients, signature (1). FORMULA G.f.: (3 + x)/(1 - x). - Bruno Berselli, Mar 18 2015 EXAMPLE a(0) = H_0(2,2) = 2+1 = 3. a(1) = H_1(2,2) = 2+2 = 4. a(2) = H_2(2,2) = 2*2 = 4. a(3) = H_3(2,2) = 2^2 = 4. a(n) = H_n(2,2) = H_{n-1}(2,H_n(2,1)) = H_{n-1}(2,2) = 4, for n>1. CROSSREFS Cf. A054871. Cf. A040000, A157532. Sequence in context: A280356 A018244 A113311 * A288177 A064042 A194882 Adjacent sequences:  A255173 A255174 A255175 * A255177 A255178 A255179 KEYWORD nonn,easy,cons AUTHOR Natan Arie' Consigli, Feb 25 2015 EXTENSIONS Edited by Danny Rorabaugh, Oct 20 2015 STATUS approved

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Last modified May 19 02:45 EDT 2019. Contains 323377 sequences. (Running on oeis4.)