a(1)=a(2)=1, a(n+1) = (a(n)^4 +1)/a(n-1).A003819a(1)=a(2)=1, a(n+1) = (a(n)^4 +1)/a(n-1).Terms a(0) =1a(1) =1a(2) =2a(3) =17a(4) =41761External referencesoeis: A003819