From: A high accuracy numerical method based on spectral theory of compact operator for biharmonic eigenvalue equations
N
\(\boldsymbol{\lambda_{1}}\)
\(\boldsymbol{\lambda_{2}}\)
\(\boldsymbol{\lambda_{4}}\)
10
237.7210683
769.9765197
1818.29231
15
237.7210675
769.9634832
1818.167926
20
1818.167924
25