Number of bilaterally asymmetric 8-hoops with n symbols.

Terms

a(0) =6a(1) =336a(2) =3795a(3) =23520a(4) =102795a(5) =355656a(6) =1039626a(7) =2674440a(8) =6223140a(9) =13354440a(10) =26807781a(11) =50885016a(12) =92095185a(13) =159981360a(14) =268161060a(15) =435614256a(16) =688255506a(17) =1060829280a(18) =1599170055a(19) =2362871280a(20) =3428409831a(21) =4892775096a(22) =6877654350