Pentanacci numbers with initial conditions a(0)=5, a(1)=1, a(2)=3, a(3)=7, a(4)=15.

Terms

a(0) =5a(1) =1a(2) =3a(3) =7a(4) =15a(5) =31a(6) =57a(7) =113a(8) =223a(9) =439a(10) =863a(11) =1695a(12) =3333a(13) =6553a(14) =12883a(15) =25327a(16) =49791a(17) =97887a(18) =192441a(19) =378329a(20) =743775a(21) =1462223a(22) =2874655a(23) =5651423a(24) =11110405a(25) =21842481a(26) =42941187a(27) =84420151a(28) =165965647a(29) =326279871