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 A290648 #15 Aug 18 2017 09:58:09 %S A290648 6,12,14,16,18,19,18,20,22,23,22 %N A290648 a(n) is the smallest number of faces of the triangular lattice required to enclose an area consisting of exactly n faces. %F A290648 Conjecture: a(n) = 2*A067628(n) + 6. %Y A290648 Triangular version of A235382. %K A290648 nonn,more %O A290648 0,1 %A A290648 _Christian Majenz_, Aug 08 2017