Poincaré series for hyperbolic reflection group with Coxeter diagram o-(5)-o---o-(5)-o.

Terms

a(0) =1a(1) =4a(2) =9a(3) =17a(4) =30a(5) =50a(6) =80a(7) =125a(8) =193a(9) =296a(10) =450a(11) =680a(12) =1025a(13) =1541a(14) =2312a(15) =3466a(16) =5194a(17) =7781a(18) =11653a(19) =17448a(20) =26122a(21) =39104a(22) =58533a(23) =87613a(24) =131138a(25) =196282a(26) =293784a(27) =439717a(28) =658137a(29) =985048