886731088896domain: NAppears in sequencesKnopfmacher expansion of sqrt(2): a(2n) = 2*(a(2n-1) + 1)^2 - 1, a(2n+1) = 2*(a(2n)^2 - 1).at n=4A007759Numbers k such that 2*k*(k+2) is a square.at n=16A082639