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A181236
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T(n,k)=Number of (k*n)Xn binary matrices with all row sums equal and all column sums equal
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5
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2, 2, 4, 2, 8, 14, 2, 22, 182, 140, 2, 72, 3362, 49772, 4322, 2, 254, 69302, 33235358, 113400002, 434542, 2, 926, 1513514, 27896484332, 5210265060002, 4027811102702, 144109562, 2, 3434, 34306274, 26012734507190, 298289608088472002
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history;
text;
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OFFSET
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1,1
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COMMENTS
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Table starts
............2...................2....................2..................2
............4...................8...................22.................72
...........14.................182.................3362..............69302
..........140...............49772.............33235358........27896484332
.........4322...........113400002........5210265060002.298289608088472002
.......434542.......4027811102702.90698868503010138802...................
....144109562.1237505791330809002........................................
.165431317452............................................................
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LINKS
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R. H. Hardin, Table of n, a(n) for n=1..41
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EXAMPLE
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All solutions for 6X2
..0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..0..0....0..1....0..1....0..1....0..1....1..0....1..0....1..0....1..0....1..0
..0..0....0..1....1..0....1..0....1..0....0..1....0..1....0..1....1..0....1..0
..0..0....1..0....0..1....1..0....1..0....0..1....1..0....1..0....0..1....0..1
..0..0....1..0....1..0....1..0....0..1....1..0....1..0....0..1....1..0....0..1
..0..0....1..0....1..0....0..1....1..0....1..0....0..1....1..0....0..1....1..0
...
..0..1....1..0....1..0....1..0....1..0....1..0....1..0....1..0....1..0....1..0
..1..0....0..1....0..1....0..1....0..1....0..1....0..1....1..0....1..0....1..0
..1..0....0..1....0..1....0..1....1..0....1..0....1..0....0..1....0..1....0..1
..1..0....0..1....1..0....1..0....0..1....0..1....1..0....0..1....0..1....1..0
..0..1....1..0....1..0....0..1....1..0....0..1....0..1....1..0....0..1....0..1
..0..1....1..0....0..1....1..0....0..1....1..0....0..1....0..1....1..0....0..1
...
..1..0....1..1
..1..0....1..1
..1..0....1..1
..0..1....1..1
..0..1....1..1
..0..1....1..1
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CROSSREFS
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Column 1 is A067209
Row 2 is twice A112849
Sequence in context: A131999 A103178 A173300 * A087909 A076078 A053204
Adjacent sequences: A181233 A181234 A181235 * A181237 A181238 A181239
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KEYWORD
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nonn,tabl
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AUTHOR
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R. H. Hardin Oct 10 2010
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STATUS
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approved
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