login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A120147 a(n) = 23 + floor( 1 + Sum_{j=1..n-1} a(j)/2 ). 1

%I #8 May 30 2023 12:02:49

%S 23,35,52,78,117,176,264,396,594,891,1336,2004,3006,4509,6764,10146,

%T 15219,22828,34242,51363,77045,115567,173351,260026,390039,585059,

%U 877588,1316382,1974573,2961860,4442790,6664185,9996277,14994416

%N a(n) = 23 + floor( 1 + Sum_{j=1..n-1} a(j)/2 ).

%H Harvey P. Dale, <a href="/A120147/b120147.txt">Table of n, a(n) for n = 1..1000</a>

%t nxt[{t_,a_}]:=Module[{k=Floor[(47+t)/2]},{t+k,k}]; NestList[nxt,{23,23},40][[All,2]] (* _Harvey P. Dale_, Oct 29 2020 *)

%o (SageMath)

%o @CachedFunction

%o def A120147(n): return 23 + (1 + sum(A120147(k) for k in range(1,n)))//2

%o [A120147(n) for n in range(1, 61)] # _G. C. Greubel_, May 30 2023

%Y Cf. A072493, A073941, A112088.

%K nonn

%O 1,1

%A _Graeme McRae_, Jun 10 2006

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 22:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)