Perfect squares that are a product of two distinct triangular numbers.

Terms

a(0) =0a(1) =36a(2) =900a(3) =1225a(4) =7056a(5) =32400a(6) =41616a(7) =44100a(8) =88209a(9) =108900a(10) =298116a(11) =705600a(12) =1368900a(13) =1413721a(14) =1498176a(15) =2924100a(16) =5336100a(17) =8643600a(18) =8820900a(19) =9217296a(20) =10432900a(21) =15210000a(22) =24147396a(23) =37088100a(24) =48024900a(25) =50893956a(26) =50979600a(27) =52490025a(28) =55353600a(29) =80568576