Sigma(A033631(n)) {sigma is the sum of divisors function A000203}.

Terms

a(0) =1a(1) =120a(2) =546a(3) =1680a(4) =2880a(5) =7812a(6) =14520a(7) =34200a(8) =40320a(9) =40320a(10) =53760a(11) =68796a(12) =63360a(13) =76608a(14) =78624a(15) =80640a(16) =89280a(17) =86400a(18) =95040a(19) =90720a(20) =129600a(21) =178560a(22) =155496a(23) =205920a(24) =214272a(25) =190080a(26) =223200a(27) =245520a(28) =241920a(29) =244800