Holey Schröder Designs of Type $3^{\mathbf{n}}{\mathbf{u}}^1$

Dianhua Wu, Hantao Zhang

A holey Schröder design of type $h_1^{n_1}{h}_4^{n_2}\cdots h_k^{n_k}$ (HSD$(h_1^{n_1}{h}_4^{n_2}\cdots h_k^{n_k}))$ is equivalent to a frame idempotent Schröder quasigroup (FISQ$(h_1^…