Numbers of isomers of unbranched a-4-catapolyheptagons - see Brunvoll reference for precise definition.
A121138
Numbers of isomers of unbranched a-4-catapolyheptagons - see Brunvoll reference for precise definition.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =46a(5) =192a(6) =840a(7) =3584a(8) =15392a(9) =65536a(10) =278656a(11) =1179648a(12) =4981248a(13) =20971520a(14) =88082432a(15) =369098752a(16) =1543512064a(17) =6442450944a(18) =26843578368a(19) =111669149696a(20) =463856599040
External references
- oeis: A121138