Complete sets of linearly independent first integrals are found for the most general form of linear equations of maximal symmetry algebra of order ranging from two to eight. The corresponding Hamiltonian systems are constructed and it is shown that their general solutions can also be found by a simple superposition formula from the solutions of a scalar second-order source equation.
"First Integrals and Hamiltonians of Some Classes of ODEs of Maximal Symmetry." J. Appl. Math. 2017 1 - 9, 2017. https://doi.org/10.1155/2017/7302081