a(n) = (1/sqrt(26))((5+sqrt(26))^(n+1)-(5-sqrt(26))^(n+1)).

A109107

a(n) = (1/sqrt(26))((5+sqrt(26))^(n+1)-(5-sqrt(26))^(n+1)).

Terms

    a(0) =2a(1) =20a(2) =202a(3) =2040a(4) =20602a(5) =208060a(6) =2101202a(7) =21220080a(8) =214302002a(9) =2164240100a(10) =21856703002a(11) =220731270120

External references