Number of nonisomorphic systems (isomers) for the unsymmetrical schemes (group C_s) for unbranched tri-4-catafusenes as a function of the number of hexagons (see Cyvin et al. (1996) for precise definition).

A323940

Number of nonisomorphic systems (isomers) for the unsymmetrical schemes (group C_s) for unbranched tri-4-catafusenes as a function of the number of hexagons (see Cyvin et al. (1996) for precise definition).

Terms

    a(0) =0a(1) =1a(2) =8a(3) =52a(4) =244a(5) =1093a(6) =4490a(7) =17952a(8) =69304a(9) =262385a(10) =973916a(11) =3562532a(12) =12856716a(13) =45880933a(14) =162085694a(15) =567578784a(16) =1971766704a(17) =6801381633a(18) =23309759728a(19) =79421199860a(20) =269160256356a(21) =907726205221

External references