sawtooth181Sawtooth with minimum population 181, found on 28 April 2015, based on a suggestion by Dongook Lee and shotgun by Brett Berger. Population 181 at T=0, 6960, 849120, 102750480, ..., 58*(121^n-1), ..., giving an expansion factor of 121. https://www.conwaylife.com/wiki/Sawtooth_181