Squares of even triangular numbers.

Terms

a(0) =36a(1) =100a(2) =784a(3) =1296a(4) =4356a(5) =6084a(6) =14400a(7) =18496a(8) =36100a(9) =44100a(10) =76176a(11) =90000a(12) =142884a(13) =164836a(14) =246016a(15) =278784a(16) =396900a(17) =443556a(18) =608400a(19) =672400a(20) =894916a(21) =980100a(22) =1272384a(23) =1382976a(24) =1758276a(25) =1898884a(26) =2371600a(27) =2547216a(28) =3132900a(29) =3348900