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 A086814 #10 Aug 11 2019 14:00:23
%S A086814 2,5,9,12,16,20,24,27,31,35,39,43,47,51,55,59,63,67,71,75,79,83,87,91,
%T A086814 95,99,103,107,111,115,119,123,127,131,135,139,143,147,151,155,159,
%U A086814 163,167,171,175,179,183,187,191,195
%N A086814 a(n) = ceiling( (1 + n + 2*n^2 + 4*n^3)/(1 + 2*n + n^2) ).
%e A086814 a(2) = ceiling( (1*2^0 + 1*2^1 + 2*2^2 + 4*2^3)/(1*2^0 + 2*2^1 + 1*2^2) ) = ceiling(43/9) = ceiling(4.7777...) = 5.
%t A086814 Table[Ceiling[(1+n+2n^2+4n^3)/(1+2n+n^2)],{n,50}] (* _Harvey P. Dale_, Aug 11 2019 *)
%o A086814 (PARI) a(n) = ceil((1 + n + 2*n^2 + 4*n^3)/(1 + 2*n + n^2)); \\ _Michel Marcus_, Aug 31 2013
%Y A086814 Cf. A086790.
%K A086814 nonn,easy
%O A086814 1,1
%A A086814 Wang Dan (wangdan01(AT)lycos.com), Aug 06 2003