a(n) = A006134(A038754(n) - 1)/3^n.A320627a(n) = A006134(A038754(n) - 1)/3^n.Terms a(0) =1a(1) =1a(2) =1a(3) =13a(4) =217a(5) =12938197a(6) =913083596083External referencesoeis: A320627