Sum of two consecutive squares of Lucas numbers (A001254).

Terms

a(0) =5a(1) =10a(2) =25a(3) =65a(4) =170a(5) =445a(6) =1165a(7) =3050a(8) =7985a(9) =20905a(10) =54730a(11) =143285a(12) =375125a(13) =982090a(14) =2571145a(15) =6731345a(16) =17622890a(17) =46137325a(18) =120789085a(19) =316229930a(20) =827900705a(21) =2167472185a(22) =5674515850a(23) =14856075365a(24) =38893710245a(25) =101825055370a(26) =266581455865