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 A120156 a(n) = 11 + floor((2 + Sum_{j=1..n-1} a(j))/3). 1
 11, 15, 20, 27, 36, 48, 64, 85, 113, 151, 201, 268, 358, 477, 636, 848, 1131, 1508, 2010, 2680, 3574, 4765, 6353, 8471, 11295, 15060, 20080, 26773, 35697, 47596, 63462, 84616, 112821, 150428, 200571, 267428, 356570, 475427, 633903, 845204 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS G. C. Greubel, Table of n, a(n) for n = 1..1000 MATHEMATICA A120156[n_]:= A120156[n]= 11 +Quotient[2+Sum[A120156[k], {k, n-1}], 3]; Table[A120156[n], {n, 60}] (* G. C. Greubel, Jul 06 2023 *) PROG (Magma) function f(n, a, b) t:=0; for k in [1..n-1] do t+:= a+Floor((b+t)/3); end for; return t; end function; g:= func< n, a, b | f(n+1, a, b)-f(n, a, b) >; A120156:= func< n | g(n, 11, 2) >; [A120156(n): n in [1..60]]; // G. C. Greubel, Jul 06 2023 (SageMath) @CachedFunction def A120156(n): return 11 +(2+sum(A120156(k) for k in range(1, n)))//3 [A120156(n) for n in range(1, 61)] # G. C. Greubel, Jul 06 2023 CROSSREFS Cf. A072493, A073941, A112088. Sequence in context: A049354 A343823 A105179 * A237278 A265114 A213179 Adjacent sequences: A120153 A120154 A120155 * A120157 A120158 A120159 KEYWORD nonn AUTHOR Graeme McRae, Jun 10 2006 STATUS approved

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Last modified August 11 12:11 EDT 2024. Contains 375069 sequences. (Running on oeis4.)