a(n) = A161330(n)*3.

Terms

a(0) =0a(1) =6a(2) =24a(3) =42a(4) =60a(5) =114a(6) =132a(7) =186a(8) =240a(9) =294a(10) =384a(11) =438a(12) =528a(13) =654a(14) =672a(15) =726a(16) =780a(17) =870a(18) =1032a(19) =1122a(20) =1356a(21) =1482a(22) =1644a(23) =1878a(24) =2004a(25) =2202a(26) =2436a(27) =2490a(28) =2616a(29) =2742