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 A299017 #4 Feb 01 2018 21:00:55 %S A299017 1,3,6,10,21,36,55,78,105,136,171,210,253,300,351 %N A299017 Intersection of A264041 and A000217. %F A299017 Conjectures (Start) %F A299017 G.f.: x*(1 + 6*x^4 - 3*x^5) / (1 - x)^3. %F A299017 a(n) = 6 - 7*n + 2*n^2 for n>3. %F A299017 a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n>3. %F A299017 (End) %Y A299017 Cf. A000217, A264041. %K A299017 nonn,more %O A299017 1,2 %A A299017 _Colin Barker_, Jan 31 2018