A125673 Classification of bicyclics with the parameter 'alpha' having the value of 4. See the paper by Hendrickson and Parks for details.

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

Offset: 8

Author

Parthasarathy Nambi, Jan 29 2007

Keywords

• nonn

Comments

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

Examples

			If n=8 then the number of bicyclics when 'alpha' = four is 1.
If n=9 then the number of bicyclics when 'alpha' = four is 3.
If n=10 then the number of bicyclics when 'alpha' = four is 15.
If n=11 then the number of bicyclics when 'alpha' = four is 57.
		

References

• 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.

Crossrefs

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