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Search: id:A059525
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| A059525 |
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Number of n X n checkerboards in which the set of red squares is edge connected. |
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+0
1
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| 0, 1, 13, 218, 11506, 2301877, 1732082741, 4872949974666
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Number of nonzero nXn binary arrays with all 1's connected, would be clearer. [From Ron Hardin (rhhardin(AT)att.net), Jul 06 2009]
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CROSSREFS
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Cf. A059020, A059021.
Sequence in context: A069989 A140517 A096141 this_sequence A086147 A015253 A051621
Adjacent sequences: A059522 A059523 A059524 this_sequence A059526 A059527 A059528
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KEYWORD
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nonn
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AUTHOR
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David Radcliffe (radcl008(AT)umn.edu), Jan 21 2001
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EXTENSIONS
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One more term from John W. Layman (layman(AT)vt.edu), Jan 25 2001
More terms from Ron Hardin (rhhardin(AT)att.net), Feb 28 2002
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