Necklace permutations.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =14a(6) =57a(7) =347a(8) =2375a(9) =20752a(10) =200805a(11) =2293192a(12) =28097136a(13) =381963696a(14) =5651257984a(15) =87997162749