a(n) = Fibonacci(4n) + 1, or Fibonacci(2n-1)*Lucas(2n+1).

A081002

a(n) = Fibonacci(4n) + 1, or Fibonacci(2n-1)*Lucas(2n+1).

Terms

    a(0) =1a(1) =4a(2) =22a(3) =145a(4) =988a(5) =6766a(6) =46369a(7) =317812a(8) =2178310a(9) =14930353a(10) =102334156a(11) =701408734a(12) =4807526977a(13) =32951280100a(14) =225851433718

External references