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a(n) = abs(floor(n*cos(n))).
4

%I #10 Oct 08 2019 15:06:57

%S 0,0,1,3,3,1,5,5,2,9,9,0,10,11,1,12,16,5,11,18,8,12,22,13,10,24,16,8,

%T 27,22,4,28,26,1,29,32,5,28,36,10,27,41,17,23,43,23,20,47,31,14,48,37,

%U 9,49,45,1,47,51,6,46,58,16,41,62,25,37,66,35,29,68,44,22,70,54,12,69,62,3

%N a(n) = abs(floor(n*cos(n))).

%H Rémy Sigrist, <a href="/A105663/b105663.txt">Table of n, a(n) for n = 0..10000</a>

%o (PARI) a(n) = abs(floor(n*cos(n))); \\ _Michel Marcus_, Oct 09 2013

%Y Cf. A105662, A105664.

%K nonn,look

%O 0,4

%A _Zak Seidov_, May 04 2005