G.f. satisfies A(x) = 1 + x*cycle_index(G,A(x)) where G = cyclic group of order 2 generated by (1,2)(3,4).

A036723

G.f. satisfies A(x) = 1 + x*cycle_index(G,A(x)) where G = cyclic group of order 2 generated by (1,2)(3,4).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =8a(4) =30a(5) =135a(6) =622a(7) =3032a(8) =15134a(9) =77506a(10) =403780a(11) =2135588a(12) =11430910a(13) =61815916a(14) =337193808a(15) =1853183376a(16) =10251612034a(17) =57037706410a(18) =318965425380

External references