The number of regions in the G-Shi arrangement when G is the cycle graph C_n.

Terms

a(0) =1a(1) =3a(2) =16a(3) =61a(4) =206a(5) =659a(6) =2052a(7) =6297a(8) =19162a(9) =58015a(10) =175088a(11) =527333a(12) =1586118a(13) =4766571a(14) =14316124a(15) =42981169a(16) =129009074a(17) =387158327a(18) =1161737160a(19) =3485735805a(20) =10458256030a(21) =31376865283a(22) =94134790196a(23) =282412759241a(24) =847255054986