a(n) is the largest highly composite number (definition 1) not a multiple of n.

Terms

a(0) =1a(1) =4a(2) =6a(3) =48a(4) =4a(5) =720a(6) =1260a(7) =1680a(8) =48a(9) =50400a(10) =6a(11) =665280a(12) =720a(13) =48a(14) =1081080a(15) =43243200a(16) =1680a(17) =2205403200a(18) =48a(19) =720a(20) =50400a(21) =293318625600a(22) =1260a(23) =128501493120a(24) =665280a(25) =4655851200a(26) =720a(28) =48a(31) =50400a(32) =43243200