Poincaré series for hyperbolic reflection group with Coxeter diagram o-(4)-o---o-(5)-o.

Terms

a(0) =1a(1) =4a(2) =9a(3) =17a(4) =29a(5) =46a(6) =70a(7) =103a(8) =148a(9) =210a(10) =295a(11) =411a(12) =569a(13) =783a(14) =1074a(15) =1470a(16) =2008a(17) =2740a(18) =3736a(19) =5091a(20) =6934a(21) =9440a(22) =12848a(23) =17483a(24) =23786a(25) =32358a(26) =44016a(27) =59871a(28) =81435a(29) =110762