a(n) = sigma(A067651(n)).

Terms

a(0) =1a(1) =8a(2) =20a(3) =48a(4) =144a(5) =240a(6) =720a(7) =480a(8) =756a(9) =720a(10) =864a(11) =2304a(12) =2880a(13) =4080a(14) =5040a(15) =6240a(16) =6048a(17) =6720a(18) =9984a(19) =21600a(20) =90720a(21) =506880a(22) =806400a(23) =748800a(24) =973440a(25) =1153152