a(n) = A000079(n) - A153130(n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =9a(5) =27a(6) =63a(7) =126a(8) =252a(9) =504a(10) =1017a(11) =2043a(12) =4095a(13) =8190a(14) =16380a(15) =32760a(16) =65529a(17) =131067a(18) =262143a(19) =524286a(20) =1048572a(21) =2097144a(22) =4194297a(23) =8388603a(24) =16777215a(25) =33554430a(26) =67108860a(27) =134217720a(28) =268435449a(29) =536870907