232406domain: NAppears in sequencesa(n) = 4*a(n-1) - a(n-2), a(0)=1, a(1)=6.at n=9A054491Combined Diophantine Chebyshev sequences A054491 and A077234.at n=18A077237Number of integral solutions to the equation (x_1)^3 + ... + (x_n)^3 = (x_1 + ... + x_n)^2 with 1 <= x_1 <= ... <= x_n.at n=15A158649