Generalized class numbers c_(n,3).

Terms

a(0) =61a(1) =2763a(2) =38528a(3) =249856a(4) =1066590a(5) =3487246a(6) =9493504a(7) =22634496a(8) =48649086a(9) =96448478a(10) =179369856a(11) =315621376a(12) =530788622a(13) =860061996a(14) =1346126848a(15) =2046820352a(16) =3038120316a(17) =4403100222a(18) =6254596992a(19) =8737505280a(20) =11992903772