The number of regions inside an octagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.

A333075

The number of regions inside an octagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.

Terms

    a(0) =80a(1) =1488a(2) =9312a(3) =31552a(4) =83432a(5) =174816a(6) =339816a(7) =584176a(8) =953416a(9) =1463936a(10) =2173976a(11) =3074784a(12) =4294080a(13) =5790816a(14) =7664880a(15) =9952944a(16) =12757088a(17) =16036096a(18) =20013696a(19) =24577760a(20) =29973528a(21) =36161472a(22) =43314312a(23) =51334672

External references