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%I A008363 #11 Dec 19 2016 01:58:21
%S A008363 0,0,0,0,0,1,2,2,2,2,4,6,6,6,6,9,12,12,12,12,16,20,20,20,20,25,30,30,
%T A008363 30,30,36,42,42,42,42,49,56,56,56,56,64,72,72,72,72,81,90,90,90,90,
%U A008363 100,110,110,110,110,121,132,132
%N A008363 a(n) = floor(n/5)*ceiling(n/5).
%F A008363 From _R. J. Mathar_, Mar 11 2012: (Start)
%F A008363 a(n) = a(n-1) +2 a(n-5) -2 a(n-6) -a(n-10) +a(n-11).
%F A008363 G.f.: x^5*(1+x)/((1-x)^3*(1+x+x^2+x^3+x^4)^2). (End)
%K A008363 nonn
%O A008363 0,7
%A A008363 _N. J. A. Sloane_

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