Short leg of more than one Pythagorean triangle.

Terms

a(0) =9a(1) =12a(2) =15a(3) =16a(4) =18a(5) =20a(6) =21a(7) =24a(8) =25a(9) =27a(10) =28a(11) =30a(12) =32a(13) =33a(14) =35a(15) =36a(16) =39a(17) =40a(18) =42a(19) =44a(20) =45a(21) =48a(22) =49a(23) =50a(24) =51a(25) =52a(26) =54a(27) =55a(28) =56a(29) =57