Number of intersection points formed by drawing the line segments connecting any two lattice points of an n X m convex lattice polygon written as triangle T(n,m), n >= 1, 1 <= m <= n.
A288180
Number of intersection points formed by drawing the line segments connecting any two lattice points of an n X m convex lattice polygon written as triangle T(n,m), n >= 1, 1 <= m <= n.
Terms
- a(0) =5a(1) =13a(2) =37a(3) =35a(4) =121a(5) =353a(6) =75a(7) =265a(8) =771a(9) =1761a(10) =159a(11) =587a(12) =1755a(13) =4039a(14) =8917a(15) =275a(16) =1019a(17) =3075a(18) =7035a(19) =15419a(20) =26773a(21) =477a(22) =1797a(23) =5469a(24) =12495a(25) =27229a(26) =47685a(27) =84497a(28) =755a(29) =2823
External references
- oeis: A288180