a(n) = (Lucas(4*n+2) + 2)/5, or Fibonacci(2*n+1)^2, or A081067(n)/5.

A081068

a(n) = (Lucas(4*n+2) + 2)/5, or Fibonacci(2*n+1)^2, or A081067(n)/5.

Terms

    a(0) =1a(1) =4a(2) =25a(3) =169a(4) =1156a(5) =7921a(6) =54289a(7) =372100a(8) =2550409a(9) =17480761a(10) =119814916a(11) =821223649a(12) =5628750625a(13) =38580030724a(14) =264431464441

External references