On Cayley's enumeration of alkanes (or 4-valent trees).
Rains, E.M. ; Sloane, N.J.A.
Journal of Integer Sequences [electronic only], Tome 2 (1999), / Harvested from The Electronic Library of Mathematics
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Publié le : 1999-01-01
EUDML-ID : urn:eudml:doc:230307 
@article{01264488,
     title = {On Cayley's enumeration of alkanes (or 4-valent trees).},
     journal = {Journal of Integer Sequences [electronic only]},
     volume = {2},
     year = {1999},
     zbl = {0999.05053},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01264488}
}

Rains, E.M.; Sloane, N.J.A. On Cayley's enumeration of alkanes (or 4-valent trees).. Journal of Integer Sequences [electronic only], Tome 2 (1999) . http://gdmltest.u-ga.fr/item/01264488/