a(n) = Fibonacci(n) * (2*Fibonacci(n) + 1).

Terms

a(0) =0a(1) =3a(2) =3a(3) =10a(4) =21a(5) =55a(6) =136a(7) =351a(8) =903a(9) =2346a(10) =6105a(11) =15931a(12) =41616a(13) =108811a(14) =284635a(15) =744810a(16) =1949325a(17) =5102415a(18) =13356696a(19) =34965703a(20) =91537215a(21) =239640778a(22) =627376753a(23) =1642475955a(24) =4300029216a(25) =11257576275a(26) =29472642291a(27) =77160257866a(28) =202007981253a(29) =528863443111