https://mathworld.wolfram.com/IrredundantRamseyNumber.html
Irredundant Ramsey Number -- from Wolfram MathWorld
Let G_1, G_2, ..., G_t be a t-graph edge coloring of the complete graph K_n, where for each i=1, 2, ..., t, G_i is the spanning subgraph of K_n consisting of...
wolfram mathworldramseynumber