%N An old nuclear shell closure sequence for 2 nucleon states (related to A007290 and A018226) in a square potential well.
%C An earlier theory that led to the nuclear magic number shell theory of A018226.
%D W. E. Burcham, Nuclear Physics, An Introduction, McGraw-Hill, New York, 1963, page 367-368.
%F a(n) = 2*(2*l+1) for quantum number l.
%Y Cf. A007290 and A018226.
%A _Roger L. Bagula_, Apr 06 2006