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First term of n-th difference sequence of (floor(Pi*k/6)), k >= 0.
2

%I #4 Jun 06 2019 22:00:33

%S 0,1,-2,4,-8,16,-32,64,-128,256,-512,1024,-2048,4096,-8192,16384,

%T -32768,65536,-131072,262144,-524288,1048576,-2097151,4194280,

%U -8388307,16774590,-33536530,67007280,-133718550,266253060,-528213975,1042120800,-2039889435

%N First term of n-th difference sequence of (floor(Pi*k/6)), k >= 0.

%H Clark Kimberling, <a href="/A325744/b325744.txt">Table of n, a(n) for n = 1..200</a>

%t Table[First[Differences[Table[Floor[(Pi/6)*n], {n, 0, 50}], n]], {n, 1, 50}]

%Y Cf. A019673, A325664.

%K easy,sign

%O 1,3

%A _Clark Kimberling_, Jun 06 2019