-3-Knödel numbers.

Terms

a(0) =9a(1) =21a(2) =45a(3) =63a(4) =105a(5) =117a(6) =273a(7) =285a(8) =585a(9) =627a(10) =765a(11) =1365a(12) =1449a(13) =1677a(14) =3705a(15) =3885a(16) =4221a(17) =4485a(18) =4797a(19) =7137a(20) =7565a(21) =8109a(22) =10197a(23) =10545a(24) =11445a(25) =13065a(26) =14637a(27) =16965a(28) =19437a(29) =20805