a(n) = A238823(n) - A238826(n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =31a(6) =77a(7) =192a(8) =474a(9) =1170a(10) =2881a(11) =7097a(12) =17477a(13) =43050a(14) =106043a(15) =261235a(16) =643552a(17) =1585421a(18) =3905750a(19) =9621993a(20) =23704161a(21) =58396118a(22) =143860974a(23) =354406732a(24) =873093707a(25) =2150897733a(26) =5298813853a(27) =13053818630a(28) =32158552201a(29) =79223751853