a(n) = Knuth's Fibonacci (or circle) square "n o n".

Terms

a(0) =3a(1) =8a(2) =21a(3) =40a(4) =55a(5) =84a(6) =105a(7) =144a(8) =189a(9) =220a(10) =275a(11) =336a(12) =377a(13) =448a(14) =495a(15) =576a(16) =663a(17) =720a(18) =817a(19) =880a(20) =987a(21) =1100a(22) =1173a(23) =1296a(24) =1425a(25) =1508a(26) =1647a(27) =1736a(28) =1885a(29) =2040