Coordination sequence for hyperbolic tessellation 3^7 (from triangle group (2,3,7)).

Terms

a(0) =1a(1) =7a(2) =21a(3) =56a(4) =147a(5) =385a(6) =1008a(7) =2639a(8) =6909a(9) =18088a(10) =47355a(11) =123977a(12) =324576a(13) =849751a(14) =2224677a(15) =5824280a(16) =15248163a(17) =39920209a(18) =104512464a(19) =273617183a(20) =716339085a(21) =1875400072a(22) =4909861131a(23) =12854183321a(24) =33652688832a(25) =88103883175a(26) =230658960693a(27) =603872998904