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A006067
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Number of ways to quarter an n X n chessboard.
(Formerly M3769)
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5
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1, 1, 1, 5, 7, 37, 104, 766, 3970, 43318, 431932, 7695805, 137066448, 4015896016, 128095791922, 6371333036059, 355704307903818, 30153126159555641, 2952926822418475378, 431453249608567040694, 73569487283165427567144, 18558756256964594960321428
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listen;
history;
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OFFSET
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1,4
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COMMENTS
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See A257952 for much more information.
See A272070 for information on odd terms.
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REFERENCES
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M. Gardner, The Unexpected Hanging and Other Mathematical Diversions. Simon and Schuster, NY, 1969, p. 189.
Popular Computing, Vol. 1 (No. 7, 1973), front cover and page 2.
T. R. Parkin, personal communication.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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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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