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

A121133

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =16a(6) =38a(7) =80a(8) =180a(9) =384a(10) =840a(11) =1792a(12) =3856a(13) =8192a(14) =17440a(15) =36864a(16) =77888a(17) =163840a(18) =344192a(19) =720896a(20) =1507584a(21) =3145728a(22) =6554112a(23) =13631488a(24) =28312576a(25) =58720256a(26) =121636864a(27) =251658240a(28) =520097792a(29) =1073741824

External references