Layer counting sequence for hyperbolic tessellation by regular pentagons of angle 2*Pi/5.

A054889

Layer counting sequence for hyperbolic tessellation by regular pentagons of angle 2*Pi/5.

Terms

    a(0) =1a(1) =5a(2) =20a(3) =70a(4) =245a(5) =860a(6) =3015a(7) =10570a(8) =37060a(9) =129935a(10) =455560a(11) =1597225a(12) =5599980a(13) =19633910a(14) =68837825a(15) =241350100a(16) =846189875a(17) =2966799290a(18) =10401800220a(19) =36469419475a(20) =127864266640a(21) =448300820765

External references