978122

Appears in sequences

• a(0) = 1, a(1) = 2, a(n) = 4*a(n-1) - a(n-2).at n=11A001075
• a(2*n) = a(2*n-1) + a(2*n-2), a(2*n+1) = 2*a(2*n) + a(2*n-1); a(0) = a(1) = 1.at n=22A002531
• a(n) = (1 + a(n-1)*a(n-2))/a(n-3), a(0) = a(1) = a(2) = 1.at n=23A005246
• a(n) = 14*a(n-1) - a(n-2); a(0) = a(1) = 2.at n=6A094347
• Expansion of (1-x)*(2*x^2-4*x+1)/(1-2*x+5*x^2-4*x^3+x^4).at n=22A131039
• Interleave denominators and numerators of convergents to sqrt(3).at n=32A140827
• Numerators of principal and intermediate convergents to 3^(1/2).at n=31A143642
• Generalized Markoff numbers: largest number a in a 5-tuple a >= b >= c >= d >= e satisfying the Markoff(5) equation a^2 + b^2 + c^2 + d^2 + e^2 = 4*a*b*c*d*e.at n=29A229241
• List of triples (r,s,t): the matrix M = [[4,12,9][2,7,6][1,4,4]] is raised to successive powers, then (r,s,t) are the square roots of M[3,1], M[1,1], M[1,3] respectively.at n=34A249578
• Denominators of the other-side convergents to sqrt(3).at n=21A259592
• Numerators of the other-side convergents to sqrt(3).at n=20A259593