Comment on Wigner numbers [J. Chem. Phys. 151, 244122 (2019)]

An alternative combinatorial expression is presented for the Wigner numbers Wm,nJ that leads to a generating function and to several new identities. An extended class of Wigner numbers, Wigner numbers of the lth order, Wm,nJ,l, is also introduced.

Automated summary

An alternative combinatorial expression for the Wigner numbers is presented, leading to a generating function and new identities. The introduction of an extended class of Wigner numbers of the lth order is also mentioned.