A125673 - OEIS

%I #3 Mar 30 2012 17:25:50

%S 1,3,15,57,231,853,3131,11007

%N Classification of bicyclics with the parameter 'alpha' having the value of 4. See the paper by Hendrickson and Parks for details.

%C Here 'alpha' is the number of atoms the two rings have in common.

%D James B. Hendrickson and Camden A. Parks, "Generation and Enumeration of Carbon Skeletons", J. Chem. Inf. Comput. Sci., vol. 31 (1991), pp. 101-107. See Table VII column 6 on page 104.

%e If n=8 then the number of bicyclics when 'alpha' = four is 1.

%e If n=9 then the number of bicyclics when 'alpha' = four is 3.

%e If n=10 then the number of bicyclics when 'alpha' = four is 15.

%e If n=11 then the number of bicyclics when 'alpha' = four is 57.

%Y Cf. A121330, A121331, A121332, A121333, A125064.

%K nonn

%O 8,2

%A _Parthasarathy Nambi_, Jan 29 2007