a(n) = 2^n - A122536(n).

Terms

a(0) =0a(1) =2a(2) =4a(3) =10a(4) =20a(5) =44a(6) =88a(7) =182a(8) =364a(9) =738a(10) =1476a(11) =2972a(12) =5944a(13) =11924a(14) =23848a(15) =47768a(16) =95536a(17) =191214a(18) =382428a(19) =765136a(20) =1530272a(21) =3061104a(22) =6122208a(23) =12245530a(24) =24491060a(25) =48984342a(26) =97968684a(27) =195941804a(28) =391883608a(29) =783776080