0,5
The number of n-node binary trees fixed by the corresponding automorphism(s).
A. Karttunen, C-program for computing the initial terms of this sequence
Sequence in context: A050920 A001231 A141150 this_sequence A124856 A061858 A005873
Adjacent sequences: A089415 A089416 A089417 this_sequence A089419 A089420 A089421
nonn
Antti Karttunen (His_Firstname.His_Surname(AT)iki.fi), Nov 29 2003
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