a(n) = 5*Fibonacci(n)^2.

Terms

a(0) =5a(1) =5a(2) =20a(3) =45a(4) =125a(5) =320a(6) =845a(7) =2205a(8) =5780a(9) =15125a(10) =39605a(11) =103680a(12) =271445a(13) =710645a(14) =1860500a(15) =4870845a(16) =12752045a(17) =33385280a(18) =87403805a(19) =228826125a(20) =599074580a(21) =1568397605a(22) =4106118245a(23) =10749957120a(24) =28143753125a(25) =73681302245a(26) =192900153620a(27) =505019158605