a(n) = a(n-1) + 5*a(n-2), for n >= 0, with a(0) = 1 and a(1) = 0.

Terms

a(0) =1a(1) =0a(2) =5a(3) =5a(4) =30a(5) =55a(6) =205a(7) =480a(8) =1505a(9) =3905a(10) =11430a(11) =30955a(12) =88105a(13) =242880a(14) =683405a(15) =1897805a(16) =5314830a(17) =14803855a(18) =41378005a(19) =115397280a(20) =322287305a(21) =899273705a(22) =2510710230a(23) =7007078755a(24) =19560629905a(25) =54596023680a(26) =152399173205a(27) =425379291605