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

Terms

a(0) =1a(1) =4a(2) =9a(3) =16a(4) =26a(5) =41a(6) =62a(7) =90a(8) =128a(9) =181a(10) =254a(11) =352a(12) =483a(13) =660a(14) =900a(15) =1224a(16) =1661a(17) =2252a(18) =3052a(19) =4133a(20) =5592a(21) =7562a(22) =10224a(23) =13821a(24) =18680a(25) =25244a(26) =34113a(27) =46096a(28) =62284a(29) =84152