Atomic and molecular species

[N. J. A. Sloane]

Christian,   A005226 and A005227 are very old sequences
and in those days I had very little space for definitions.
"Atomic species" is just a hint, the full definition 
is presumably rather more complicated.
Better get hold of the original sources!
Neil

> I don't have easy access to the Labelle/Yeh paper.  Is anyone familiar
> with it to know if that count was an error, or if A005227 is counting
> something else?