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A038715 a(n) = floor(n/4)*ceiling((n+2)/4). 0

%I

%S 0,0,0,0,2,2,2,3,6,6,6,8,12,12,12,15,20,20,20,24,30,30,30,35,42,42,42,

%T 48,56,56,56,63,72,72,72,80,90,90,90,99,110,110,110,120,132,132,132,

%U 143,156,156,156,168,182,182,182,195,210,210,210,224,240

%N a(n) = floor(n/4)*ceiling((n+2)/4).

%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (2,-2,2,0,-2,2,-2,1).

%F a(n) = 2*a(n-1) - 2*a(n-2) + 2*a(n-3) - 2*a(n-5) + 2*a(n-6) - 2*a(n-7) + a(n-8). - _R. J. Mathar_, Mar 11 2012

%t LinearRecurrence[{2,-2,2,0,-2,2,-2,1},{0,0,0,0,2,2,2,3},80] (* _Harvey P. Dale_, Nov 05 2014 *)

%K nonn

%O 0,5

%A _N. J. A. Sloane_, May 02 2000

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Last modified September 28 06:17 EDT 2021. Contains 347703 sequences. (Running on oeis4.)