Partial sums of a Jacobsthal related sequence.

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =10a(5) =31a(6) =42a(7) =127a(8) =170a(9) =511a(10) =682a(11) =2047a(12) =2730a(13) =8191a(14) =10922a(15) =32767a(16) =43690a(17) =131071a(18) =174762a(19) =524287a(20) =699050a(21) =2097151a(22) =2796202a(23) =8388607a(24) =11184810a(25) =33554431a(26) =44739242a(27) =134217727a(28) =178956970a(29) =536870911