“…It is also a special case of Cartan type S Lie algebra or Cartan type H Lie algebra. Partially due to these facts, the study of this Lie algebra or its analogs has recently attracted some authors' attentions (see, e.g., [3,5,9,10,[12][13][14]16,18]). It is well known that although Cartan type Lie algebras have a long history, their representation theory is far from being well developed.…”