a(n) = (Lucas(4*n+3) + 1)/5, or Fibonacci(2*n+1)*Fibonacci(2*n+2), or A081015(n)/5.

A081016

a(n) = (Lucas(4*n+3) + 1)/5, or Fibonacci(2*n+1)*Fibonacci(2*n+2), or A081015(n)/5.

Terms

    a(0) =1a(1) =6a(2) =40a(3) =273a(4) =1870a(5) =12816a(6) =87841a(7) =602070a(8) =4126648a(9) =28284465a(10) =193864606a(11) =1328767776a(12) =9107509825a(13) =62423800998a(14) =427859097160

External references