Number of ways (up to rotations and reflections) of arranging numbers 1 through 2n around a circle such that the sum of each pair of adjacent numbers is composite.
A191374
Number of ways (up to rotations and reflections) of arranging numbers 1 through 2n around a circle such that the sum of each pair of adjacent numbers is composite.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =44a(4) =912a(5) =61952a(6) =8160260a(7) =888954284a(8) =180955852060
External references
- oeis: A191374