We present an off-shell generating function for all cubic interactions of
Higher Spin gauge fields constructed in arXiv:1003.2877. It is a generalization
of the on-shell generating function proposed in arXiv:1006.5242, is written in
a very compact way, and turns out to have a remarkable structure.Comment: 14 pages, Latex,v.2 misprints corrected, v.3 ref. added, v. 4
published in Phys. Lett.
