This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A267187 #8 Jan 29 2016 10:51:36 %S A267187 0,3,1,4,0,6,4,7,2,7,5,8,3,8,6,9,4,9,7,10,5,10,8,11,6,11,9,12,7,12,10, %T A267187 13,8,13,11,14,9,14,12,15,10,15,13,16,11,16,14,17,12,17,15,18,13,18, %U A267187 16,19,14,19,17,20,15,20,18,21,16,21,19,22,17,22,20,23 %N A267187 Column 4 of the square array in A267181. %F A267187 Conjectures from _Colin Barker_, Jan 29 2016: (Start) %F A267187 a(n) = a(n-1)+a(n-4)-a(n-5) for n>5. %F A267187 G.f.: x*(3-2*x+3*x^2-4*x^3+3*x^4-x^7-x^8) / ((1-x)^2*(1+x)*(1+x^2)). %F A267187 (End) %Y A267187 Cf. A267181. %K A267187 nonn %O A267187 0,2 %A A267187 _N. J. A. Sloane_, Jan 17 2016