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

Terms

a(0) =0a(1) =2a(2) =2a(3) =8a(4) =18a(5) =50a(6) =128a(7) =338a(8) =882a(9) =2312a(10) =6050a(11) =15842a(12) =41472a(13) =108578a(14) =284258a(15) =744200a(16) =1948338a(17) =5100818a(18) =13354112a(19) =34961522a(20) =91530450a(21) =239629832a(22) =627359042a(23) =1642447298a(24) =4299982848a(25) =11257501250a(26) =29472520898a(27) =77160061448a(28) =202007663442a(29) =528862928882