Generalized class numbers c_(n,2).

Terms

a(0) =5a(1) =57a(2) =352a(3) =1280a(4) =3522a(5) =7970a(6) =15872a(7) =29184a(8) =49410a(9) =79042a(10) =122400a(11) =180224a(12) =257314a(13) =362340a(14) =492032a(15) =655360a(16) =867588a(17) =1117314a(18) =1420320a(19) =1803264a(20) =2237380a(21) =2745154a(22) =3380736a(23) =4080640a(24) =4881250a(25) =5874150a(26) =6928416a(27) =8126464a(28) =9600870a(29) =11133604