206604436042domain: NAppears in sequencesPisot sequence E(4,13): a(n) = floor( a(n-1)^2/a(n-2) + 1/2 ).at n=21A010900Expansion of (4+x-x^2+x^3-x^4+x^5) / (1-3*x-x^2+x^3-x^4+x^5-x^6).at n=21A274952