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a(n) = 6*n - floor(2*n*e).
1

%I #9 Sep 08 2022 08:45:59

%S 0,1,2,2,3,3,4,4,5,6,6,7,7,8,8,9,10,10,11,11,12,12,13,13,14,15,15,16,

%T 16,17,17,18,19,19,20,20,21,21,22,22,23,24,24,25,25,26,26,27,28,28,29,

%U 29,30,30,31,31,32,33,33,34,34,35,35,36,37,37,38,38,39,39,40,41

%N a(n) = 6*n - floor(2*n*e).

%H G. C. Greubel, <a href="/A195182/b195182.txt">Table of n, a(n) for n = 0..5000</a>

%t Table[6*n - Floor[2*n*E], {n, 0, 50}] (* _G. C. Greubel_, Nov 01 2017 *)

%o (PARI) for(n=0,50, print1(6*n - floor(2*n*exp(1)), ", ")) \\ _G. C. Greubel_, Nov 01 2017

%o (Magma) [6*n - Floor(2*n*Exp(1)): n in [0..50]]; // _G. C. Greubel_, Nov 01 2017

%K nonn

%O 0,3

%A _Clark Kimberling_, Sep 10 2011