Triangular numbers that are sum of squares of two distinct triangular numbers.

Terms

a(0) =1a(1) =10a(2) =36a(3) =45a(4) =136a(5) =325a(6) =666a(7) =820a(8) =1225a(9) =2080a(10) =3321a(11) =5050a(12) =7381a(13) =10440a(14) =11026a(15) =14365a(16) =18721a(17) =19306a(18) =25425a(19) =32896a(20) =41905a(21) =52650a(22) =65341a(23) =80200a(24) =90100a(25) =97461a(26) =101025a(27) =117370a(28) =140185a(29) =166176