Records in A177930.

Terms

a(0) =3a(1) =5a(2) =11a(3) =29a(4) =59a(5) =137a(6) =281a(7) =569a(8) =1151a(9) =2309a(10) =4649a(11) =9341a(12) =19139a(13) =38711a(14) =77489a(15) =155381a(16) =311681a(17) =624047a(18) =1248101a(19) =2497421a(20) =4998941a(21) =10002437a(22) =20005289a(23) =40010609a(24) =80021309a(25) =160043909a(26) =320090921a(27) =640196267a(28) =1280392739a(29) =2560793201