Total sum of the sum of divisors of the element sum over all nonempty subsets of [n].

Terms

a(0) =1a(1) =8a(2) =37a(3) =124a(4) =384a(5) =1088a(6) =2888a(7) =7480a(8) =18764a(9) =45852a(10) =110266a(11) =260935a(12) =609153a(13) =1407089a(14) =3218496a(15) =7298207a(16) =16429096a(17) =36739434a(18) =81668800a(19) =180586647a(20) =397394871a(21) =870673675a(22) =1900033959a(23) =4131237894a(24) =8952390226a(25) =19339847678a(26) =41660216922a(27) =89502201047a(28) =191809609673