#C quadratic growth in 7242x1
#C Chris Cain, 9 November 2014
#C http://conwaylife.com/forums/viewtopic.php?f=2&t=1406&p=14164#p14226
#C http://www.conwaylife.com/wiki/1xN_quadratic_growth
x = 7242, y = 1, rule = B3/S23
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