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 A386291 #3 Jul 17 2025 16:31:36 %S A386291 4,4,12,60,420,3612,35112,368940,4092660,47287812,564244824, %T A386291 6911705164,86538400312,1103802305800,14305263976080,187980058537740, %U A386291 2500329726373140,33615543407577780,456277456430657400,6246438368992478580,86175353789650193640 %N A386291 Long leg of the unique primitive Pythagorean triple whose inradius is A000108(n) and such that its long leg and its hypotenuse are consecutive natural numbers. %F A386291 a(n) = 2 * A000108(n) * (A000108(n) + 1). %Y A386291 Cf. A000108, A383251. %K A386291 nonn,easy %O A386291 0,1 %A A386291 _Miguel-Ángel Pérez García-Ortega_, Jul 17 2025