2,2

B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.

Cf. A038177.

Sequence in context: A111642 A145766 A122676 this_sequence A025171 A127214 A124723

Adjacent sequences: A038172 A038173 A038174 this_sequence A038176 A038177 A038178

nonn

N. J. A. Sloane (njas(AT)research.att.com).