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%I #6 Mar 31 2012 14:02:20
%S 1,1,2,4,11,53,307,2177,19503,219489,3041937,50727755,997525229,
%T 22742733167,592821131015,17461204518199
%N (Largest Matula-Goebel number encoding a tree with n nodes) - (smallest Matula-Goebel number encoding a tree with n nodes).
%D F. Goebel, On a 1-1-correspondence between rooted trees and natural numbers, J. Combin. Theory, B 29 (1980), 141-143.
%D D. Matula, A natural rooted tree enumeration by prime factorization, SIAM Rev. 10 (1968).
%H A. Karttunen, <a href="/A091247/a091247.scm.txt">Scheme-program for computing this sequence.</a>
%F a(n) = (A005518(n)-A005517(n))+1.
%Y Compare to A091241 and A000081. Cf. A061773.
%K nonn
%O 1,3
%A _Antti Karttunen_, Jan 03 2004
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