A121141 - OEIS

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A121141

Numbers of isomers of unbranched a-4-catapolyheptagons - see Brunvoll reference for precise definition.

%I #3 Mar 30 2012 16:50:30

%S 1,5,37,254,1690,10476,62000

%N Numbers of isomers of unbranched a-4-catapolyheptagons - see Brunvoll reference for precise definition.

%D J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13.

%K nonn

%O 4,2

%A _N. J. A. Sloane_, Aug 13 2006