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A267185 Column 2 of the square array in A267181. 0

%I

%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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Last modified January 25 17:35 EST 2022. Contains 350572 sequences. (Running on oeis4.)