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A183766
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1/32 the number of (2n+1) X 4 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.
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1
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40, 7392, 1555840, 346131968, 79420170240, 18585877094400, 4409408507412480, 1056689477487820800, 255189244398549336064, 62004700939478066266112, 15140238779254079729172480, 3712064235466595220724908032
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for 3 X 4:
..1..0..1..0....0..0..0..0....0..1..1..1....0..0..0..1....1..0..0..1
..0..1..1..0....0..1..1..0....0..1..0..1....1..0..1..0....0..0..1..0
..0..1..0..0....0..1..0..1....0..1..1..0....1..1..0..1....1..1..1..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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