Ordered legs of Pythagorean triangles.

Terms

a(0) =3a(1) =4a(2) =5a(3) =6a(4) =7a(5) =8a(6) =8a(7) =9a(8) =9a(9) =10a(10) =11a(11) =12a(12) =12a(13) =12a(14) =12a(15) =13a(16) =14a(17) =15a(18) =15a(19) =15a(20) =15a(21) =16a(22) =16a(23) =16a(24) =17a(25) =18a(26) =18a(27) =19a(28) =20a(29) =20