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a(n) = floor(7*n/10).
3

%I #14 Sep 08 2022 08:45:56

%S 0,0,1,2,2,3,4,4,5,6,7,7,8,9,9,10,11,11,12,13,14,14,15,16,16,17,18,18,

%T 19,20,21,21,22,23,23,24,25,25,26,27,28,28,29,30,30,31,32,32,33,34,35,

%U 35,36,37,37,38,39,39,40,41,42,42,43,44,44,45,46,46,47,48,49,49,50,51,51,52,53,53,54,55,56,56,57,58,58,59,60,60,61,62,63

%N a(n) = floor(7*n/10).

%p A188511:=n->floor(7*n/10); seq(A188511(n), n=0..100); # _Wesley Ivan Hurt_, Feb 02 2014

%t Table[Floor[7 n/10], {n, 0, 100}] (* _Wesley Ivan Hurt_, Feb 02 2014 *)

%o (PARI) a(n) = 7*n\10; \\ _Michel Marcus_, Feb 02 2014

%o (Magma) [Floor(7*n/10) : n in [0..80]]; // _Wesley Ivan Hurt_, Dec 02 2021

%Y Cf. A188512.

%K nonn

%O 0,4

%A _N. J. A. Sloane_, Apr 02 2011