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%I #7 Jan 30 2016 02:31:23
%S 0,1,0,4,2,5,3,6,4,7,5,8,6,9,7,10,8,11,9,12,10,13,11,14,12,15,13,16,
%T 14,17,15,18,16,19,17,20,18,21,19,22,20,23,21,24,22,25,23,26,24,27,25,
%U 28,26,29,27,30,28,31,29,32,30,33,31,34,32,35,33,36,34,37,35
%N Column 2 of the square array in A267181.
%F Conjectures from _Colin Barker_, Jan 29 2016: (Start)
%F a(n) = (2*n-5*((-1)^n-1))/4 for n>2.
%F a(n) = n/2 for n>2 and even.
%F a(n) = (n+5)/2 for n>2 and odd.
%F a(n) = a(n-1)+a(n-2)-a(n-3) for n>5.
%F G.f.: x*(1-x+3*x^2-x^3-x^4) / ((1-x)^2*(1+x)).
%F (End)
%Y Cf. A267181.
%K nonn
%O 0,4
%A _N. J. A. Sloane_, Jan 17 2016
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