0-sequence of reduction of (3n) by x^2 -> x+1.

Terms

a(0) =3a(1) =3a(2) =12a(3) =24a(4) =54a(5) =108a(6) =213a(7) =405a(8) =756a(9) =1386a(10) =2508a(11) =4488a(12) =7959a(13) =14007a(14) =24492a(15) =42588a(16) =73698a(17) =126996a(18) =218025a(19) =373065a(20) =636468a(21) =1082958a(22) =1838232a(23) =3113424a(24) =5262699a(25) =8879403a(26) =14956428a(27) =25153440a(28) =42241806a(29) =70844796