Refactorable triangular numbers.

Terms

a(0) =1a(1) =36a(2) =136a(3) =276a(4) =1176a(5) =2016a(6) =2556a(7) =2628a(8) =3240a(9) =4560a(10) =11628a(11) =12720a(12) =12880a(13) =18336a(14) =18528a(15) =25200a(16) =32640a(17) =32896a(18) =51360a(19) =64620a(20) =73920a(21) =86320a(22) =89676a(23) =100128a(24) =114960a(25) =115440a(26) =126756a(27) =131328a(28) =148240a(29) =166176