Sesquihat

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Sesquihat
x = 7, y = 5, rule = B3/S23 4bo$2obobo$bobobo$bobob2o$2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] [[ THUMBSIZE 2 ]]
Pattern type Strict still life
Number of cells 13
Bounding box 7×5
Frequency class 27.5
Discovered by Unknown
Year of discovery Unknown

Sesquihat is a 13-cell still life that is roughly halfway between a hat and twin hat. It is part of an infinite family of stringed beehive halves sandwiched between tails. Odd members have 180 degree rotational symmetry whilst even members have reflective symmetry, both with respect to their midpoints.

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