Product of sums of divisors and non-divisors.

Terms

a(0) =0a(1) =0a(2) =8a(3) =21a(4) =54a(5) =108a(6) =160a(7) =315a(8) =416a(9) =666a(10) =648a(11) =1400a(12) =1078a(13) =1944a(14) =2304a(15) =3255a(16) =2430a(17) =5148a(18) =3400a(19) =7056a(20) =6368a(21) =7812a(22) =6048a(23) =14400a(24) =9114a(25) =12978a(26) =13520a(27) =19600a(28) =12150a(29) =28296