Ordered long legs of Pythagorean triangles.

Terms

a(0) =4a(1) =8a(2) =12a(3) =12a(4) =15a(5) =16a(6) =20a(7) =21a(8) =24a(9) =24a(10) =24a(11) =28a(12) =30a(13) =32a(14) =35a(15) =36a(16) =36a(17) =40a(18) =40a(19) =42a(20) =44a(21) =45a(22) =45a(23) =48a(24) =48a(25) =48a(26) =52a(27) =55a(28) =56a(29) =56