OFFSET
1,4
COMMENTS
This is the number of pure n-cycloalkylic structures with n carbon atoms.
Stereoisomerism is not taken into account. Some of the drawn structures may or may not exist due to their strained geometries.
EXAMPLE
a(4) = 3, because here are 3 molecules with 4 carbons following the above rule: cyclobutane, bicyclobutane, tetrahedrane.
a(5) = 10, because there are 10 molecules with 5 carbons following above rule: cyclopentane, housane, spiropentane, pyramidane, bicyclopentane, propellane, tricyclo[2.1.0.0^(1,3)]pentane, tricyclo[2.1.0.0^(2,5)]pentane, tetracyclopentane, pentacyclopentane.
CROSSREFS
KEYWORD
nonn
AUTHOR
Natan Arie Consigli, Aug 03 2017
EXTENSIONS
a(0) removed and a(15)-a(24) from Andrew Howroyd, Mar 20 2020
STATUS
approved