The number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons.
A130914
The number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons.
Terms
- a(0) =2a(1) =6a(2) =20a(3) =70a(4) =252a(5) =894a(6) =3432a(7) =12870a(8) =48620a(9) =149226
External references
- oeis: A130914