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 A316851 #14 Apr 25 2019 08:31:46 %S A316851 3,5,6,7,7,8,9,9,10,9,10,11,12,11,11,12,13,11,12,13,14,15,13,14,13,14, %T A316851 15,16,13,14,15,16,17,18,15,15,16,17,15,16,17,18,19,15,16,17,18,19,20, %U A316851 21,17,18,17,18,19,20,17,18,19,20,21,22,17,18,19,20,21,22,23,24 %N A316851 Consider integer triangles as listed in rows of table A316841. Sequence gives perimeters of these triangles in the same order. %C A316851 Every number appears except 1, 2, and 4. %H A316851 Lars Blomberg, <a href="/A316851/b316851.txt">Table of n, a(n) for n = 1..3000</a> %Y A316851 Cf. A316841, A316842, A316852. %Y A316851 a(n) = A316843(n)+A316844(n)+A316845(n). %K A316851 nonn,look %O A316851 1,1 %A A316851 _N. J. A. Sloane_, Jul 23 2018