Place two n-gons with radii 1 and 2 concentrically, forming an annular area between them. Connect all the vertices with line segments that lie entirely within that area. Then a(n) is the number of regions in that figure.
A337700
Place two n-gons with radii 1 and 2 concentrically, forming an annular area between them. Connect all the vertices with line segments that lie entirely within that area. Then a(n) is the number of regions in that figure.
Terms
- a(0) =12a(1) =16a(2) =20a(3) =24a(4) =63a(5) =72a(6) =315a(7) =350a(8) =385a(9) =408a(10) =767a(11) =826a(12) =2085a(13) =2224a(14) =2363a(15) =2340a(16) =3762a(17) =3960a(18) =7644a(19) =8008a(20) =8372a(21) =8448a(22) =11850a(23) =12324a(24) =20466a(25) =21224a(26) =21982a(27) =21480a(28) =28985a(29) =29920
External references
- oeis: A337700