a(n) = a(n-1) + 2^(A007494(n-1)).

Terms

a(0) =1a(1) =5a(2) =13a(3) =45a(4) =109a(5) =365a(6) =877a(7) =2925a(8) =7021a(9) =23405a(10) =56173a(11) =187245a(12) =449389a(13) =1497965a(14) =3595117a(15) =11983725a(16) =28760941a(17) =95869805a(18) =230087533a(19) =766958445a(20) =1840700269a(21) =6135667565a(22) =14725602157a(23) =49085340525a(24) =117804817261a(25) =392682724205