25664160401domain: NAppears in sequencesa(n) = n^8 + n^6 + n^4 + n^2 + 1.at n=20A059839a(1) = 1, a(2) = a(1) + 1, a(3) = a(2)^2 + a(2) + 1; a(n + 1) = a(n)^n + a(n)^(n-1) + ... + a(n)^2 + a(n) + 1 = {a(n)^(n + 1)-1}/{a(n) - 1}.at n=4A110386