OFFSET
1,3
COMMENTS
Also number of saturated hydrocarbons (alkanes, cycloalkanes and alkylcycloalkanes) with n carbon atoms satisfying the octet rule. Stereoisomerism is not taken into account. Some of the drawn structures may or may not exist due to their strained geometries.
EXAMPLE
With 4 carbons, n-butane, i-butane, cyclobutane, bicyclobutane, methylcyclopropane and tetrahedrane are the 6 isomers satisfying the property above, so a(4)=6.
CROSSREFS
KEYWORD
nonn
AUTHOR
Natan Arie Consigli, Jul 05 2017
EXTENSIONS
a(0) removed and a(16)-a(24) from Andrew Howroyd, Mar 19 2020
STATUS
approved