Least m with n*(n+1)/2 divisors.

Terms

a(0) =1a(1) =4a(2) =12a(3) =48a(4) =144a(5) =576a(6) =960a(7) =1260a(8) =3600a(9) =82944a(10) =46080a(11) =184320a(12) =2985984a(13) =129600a(14) =55440a(15) =6881280a(16) =14745600a(17) =58982400a(18) =106168320a(19) =907200a(20) =18662400a(21) =247669456896a(22) =1321205760a(23) =2494800a(24) =207360000a(25) =45158400a(26) =7761600a(27) =978447237120a(28) =543581798400