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A191742
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Number of n X n symmetric binary matrices with each 1 adjacent to no more than 1 E or S neighboring 1
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1
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2, 6, 34, 354, 6640, 226090, 13978062, 1567580958, 318961138670, 117759554854782, 78883071103925368, 95874600035087067128, 211425486715722284229326, 845949075122781758953188444, 6141355289964517541296446302562
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OFFSET
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1,1
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..36
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EXAMPLE
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Some solutions for n=5
..0..0..0..0..1....0..1..0..1..1....0..0..1..1..0....1..0..0..0..0
..0..1..0..0..0....1..0..0..0..1....0..0..0..1..1....0..1..0..0..1
..0..0..1..0..1....0..0..1..0..1....1..0..0..0..1....0..0..0..1..1
..0..0..0..1..0....1..0..0..0..0....1..1..0..1..0....0..0..1..0..1
..1..0..1..0..0....1..1..1..0..0....0..1..1..0..1....0..1..1..1..1
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CROSSREFS
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Sequence in context: A168362 A274711 A076863 * A181082 A118186 A317080
Adjacent sequences: A191739 A191740 A191741 * A191743 A191744 A191745
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jun 13 2011
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STATUS
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approved
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