%I #14 Nov 29 2024 17:34:40
%S 1,4,2,5,0,5,3,6,1,6,4,7,2,7,5,8,3,8,6,9,4,9,7,10,5,10,8,11,6,11,9,12,
%T 7,12,10,13,8,13,11,14,9,14,12,15,10,15,13,16,11,16,14,17,12,17,15,18,
%U 13,18,16,19,14,19,17,20,15,20,18,21,16,21,19,22,17,22,20,23,18,23,21,24,19
%N Row 4 of the square array in A267181.
%F Conjectures from _Colin Barker_, Jan 29 2016: (Start)
%F a(n) = a(n-1)+a(n-4)-a(n-5) for n>5.
%F G.f.: (1+3*x-2*x^2+3*x^3-6*x^4+2*x^5) / ((1-x)^2*(1+x)*(1+x^2)). (End)
%F Conjectured e.g.f.: (8 - 5*cos(x) + (1 + x)*cosh(x) - sin(x) + (16 + x)*sinh(x))/4. - _Stefano Spezia_, Nov 29 2024
%Y Cf. A267181.
%K nonn
%O 0,2
%A _N. J. A. Sloane_, Jan 17 2016