Unbranched mono-5-catapolyheptagons.A038175Unbranched mono-5-catapolyheptagons.Terms a(0) =0a(1) =2a(2) =12a(3) =54a(4) =256a(5) =1144a(6) =5120a(7) =22496a(8) =98304External referencesoeis: A038175