Number of intersections inside an equilateral triangular figure formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. If three or more lines meet at an interior point this intersection is counted only once.
A092866
Number of intersections inside an equilateral triangular figure formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. If three or more lines meet at an interior point this intersection is counted only once.
Terms
- a(0) =0a(1) =4a(2) =49a(3) =166a(4) =543a(5) =1237a(6) =2511a(7) =4762a(8) =7777a(9) =12262a(10) =18933a(11) =28504a(12) =39078a(13) =56065a(14) =73879a(15) =95962a(16) =124653a(17) =164761a(18) =203259a(19) =258646a(20) =311233a(21) =377932a(22) =458793a(23) =560755a(24) =648936a(25) =775258a(26) =908893a(27) =1056520a(28) =1215087a(29) =1428193
External references
- oeis: A092866