Rich’s p18

Hot on the heels of Rich’s p16, here’s a period 18 oscillator, once again found using apgsearch. It even bears a family resemblance to the p16: D2_+1 symmetry and shuttle behavior. But… it doesn’t work in Life (B3/S23). It works in B357/S23.Screenshot - 070816 - 11:54:22


x = 13, y = 5, rule = B357/S23