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 A309360 #8 Aug 13 2019 08:15:13 %S A309360 19,23,29,39,41,47,59,65,69,71,79,83,87,89,95,103,109,111,119,125,129, %T A309360 131,139,143,149,151,153,155,159,167,169,179,181,191,197,199,203,207, %U A309360 209,215,219,223,227,229,233,237,239,251,259,263,265,269 %N A309360 Numbers n such that the number of interior intersection points A091908(n) of the n-intersected triangle decreases when the subdivision of the triangle is refined from n-1 to n cutting line segments. %C A309360 A091908(a(n)) < A091908(a(n)+1). %H A309360 Hugo Pfoertner, <a href="/A309360/a309360.pdf">Illustration of first term</a>, A091908(19)>A091908(20). %e A309360 a(1) = 19 because A091908(20)=961 < A091908(19)=972 is the first occurrence of a decrease in A091908. %Y A309360 Cf. A091908, A092098, A309361. %K A309360 nonn %O A309360 1,1 %A A309360 _Hugo Pfoertner_, Jul 26 2019