Hexanacci numbers: a(n)=a(n-1)+a(n-2)+a(n-3)+a(n-4)+a(n-5)+a(n-6), {0,1,2,3,4,5...}.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =15a(7) =30a(8) =59a(9) =116a(10) =229a(11) =454a(12) =903a(13) =1791a(14) =3552a(15) =7045a(16) =13974a(17) =27719a(18) =54984a(19) =109065a(20) =216339a(21) =429126a(22) =851207a(23) =1688440a(24) =3349161a(25) =6643338a(26) =13177611a(27) =26138883a(28) =51848640a(29) =102846073