Sum of the divisors of A001045(n) (Jacobsthal numbers).

Terms

a(0) =1a(1) =1a(2) =4a(3) =6a(4) =12a(5) =32a(6) =44a(7) =108a(8) =260a(9) =384a(10) =684a(11) =2688a(12) =2732a(13) =5632a(14) =15936a(15) =27864a(16) =43692a(17) =153920a(18) =174764a(19) =499968a(20) =953920a(21) =1477440a(22) =2796204a(23) =11708928a(24) =12253248a(25) =22380544a(26) =69769600a(27) =115568640a(28) =181990200a(29) =620101632