Number of 5-way intersections in the interior of a regular 6n-gon.

Terms

a(0) =0a(1) =0a(2) =54a(3) =24a(4) =180a(5) =216a(6) =546a(7) =336a(8) =648a(9) =720a(10) =990a(11) =936a(12) =1404a(13) =2352a(14) =1890a(15) =1824a(16) =2448a(17) =2592a(18) =3078a(19) =3720a(20) =4284a(21) =3960a(22) =4554a(23) =4464a(24) =5400a(25) =5616a(26) =6318a(27) =7896a(28) =7308a(29) =7560