14510839domain: NAppears in sequencesa(n) = 6*a(n-1) + a(n-2) for n > 1, with a(0) = a(1) = 1.at n=10A015451Numerators of convergents to 3/(1 + sqrt(10)).at n=28A093611Numbers m such that 10*m^2 - 6 is a square.at n=9A221875Denominators of continued fraction convergents to sqrt(10)/2 = sqrt(5/2) = A020797 + 1.at n=28A295334