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A134963
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Number of configurations in Conway's game of "Life" that fit into an n X n square and vanish in one step.
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2
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2, 11, 51, 860, 28156, 1093273, 110321561, 21929490122, 6858741615699, 4400789480783375, 5530201631127973447, 12721104195050291553064, 75225548540139768335134985, 4080967796136376032811105207453
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OFFSET
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1,1
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COMMENTS
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These counts have not been reduced to take account of the symmetries of the board.
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REFERENCES
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E. R. Berlekamp, J. H. Conway and R. K. Guy, Winning Ways, Academic Press, NY, 2 vols., 1982; see Chapter 25.
D. E. Knuth, The Art of Computer Programming, Vol. 4A, Section 7.1.4.
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LINKS
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EXAMPLE
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For example, a(2)=11 because the 2 X 2 configurations remain nonempty if and only if they have more than two live cells; 1 + 4 + 6 = 11.
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CROSSREFS
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KEYWORD
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nonn,nice
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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