Total number of isomers (nonisomorphic systems) of unbranched tri-4-catafusenes as a function of the number of hexagons (see Cyvin et al. (1996) for precise definition).
A323941
Total number of isomers (nonisomorphic systems) of unbranched tri-4-catafusenes as a function of the number of hexagons (see Cyvin et al. (1996) for precise definition).
Terms
- a(0) =1a(1) =3a(2) =16a(3) =62a(4) =275a(5) =1121a(6) =4584a(7) =18012a(8) =69573a(9) =262495a(10) =974704a(11) =3562714a(12) =12859127a(13) =45881213a(14) =162093320a(15) =567579192a(16) =1971791241a(17) =6801382203a(18) =23309839120a(19) =79421200630a(20) =269160513115a(21) =907726206233
External references
- oeis: A323941