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From: evert@botter.UUCP (Evert Wattel)
Newsgroups: net.math
Subject: hairy combinatorics problem.
Message-ID: <514@botter.UUCP>
Date: Thu, 13-Feb-86 06:02:29 EST
Article-I.D.: botter.514
Posted: Thu Feb 13 06:02:29 1986
Date-Received: Sun, 16-Feb-86 09:07:17 EST
Organization: VU Informatica, Amsterdam
Lines: 15

The answer concerning the counts of different acyclic hydrocarbons is
already solved by Po'lya in 1937 in his article


  G. PO'LYA	Kombinatorische Anzahlbestimmungen fu"r Graphen, Gruppen
		und Chemische Verbindungen,
		Acta Math. 68 (1937) p145-254.

The method is simply a generating function application to study the number
regular tree graphs.
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					Evert Wattel
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					botter@evert