Smallest square divisible by the n-th triangular number (n(n+1)/2).

Terms

a(0) =1a(1) =9a(2) =36a(3) =100a(4) =225a(5) =441a(6) =196a(7) =36a(8) =225a(9) =3025a(10) =4356a(11) =6084a(12) =8281a(13) =11025a(14) =3600a(15) =4624a(16) =2601a(17) =3249a(18) =36100a(19) =44100a(20) =53361a(21) =64009a(22) =19044a(23) =900a(24) =4225a(25) =13689a(26) =15876a(27) =164836a(28) =189225a(29) =216225