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A185825
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T(n,k)=1/5 the number of nXk 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
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8
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0, 1, 1, 1, 9, 1, 5, 76, 76, 5, 9, 656, 1584, 656, 9, 29, 5680, 49036, 49036, 5680, 29, 65, 49248, 1266624, 4443292, 1266624, 49248, 65, 181, 426928, 35446376, 378212944, 378212944, 35446376, 426928, 181, 441, 3701360, 956312244, 32995092992
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OFFSET
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1,5
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COMMENTS
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Table starts
....0........1...........1.............5..............9.............29
....1........9..........76...........656...........5680..........49248
....1.......76........1584.........49036........1266624.......35446376
....5......656.......49036.......4443292......378212944....32995092992
....9.....5680.....1266624.....378212944...100480040192.28043363244452
...29....49248....35446376...32995092992.28043363244452
...65...426928...956312244.2852526229300
..181..3701360.26231137608
..441.32089696
.1165
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..60
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EXAMPLE
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Some solutions for 5X4 with a(1,1)=0
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..1..1..1..0....0..1..1..0....1..1..1..0....1..1..1..0....0..1..1..0
..3..0..3..0....4..2..2..0....2..3..0..0....2..2..2..0....4..1..2..0
..3..0..3..0....4..0..2..1....2..3..0..2....0..0..4..4....4..0..2..4
..3..2..2..2....0..0..2..1....3..3..0..2....4..4..2..2....4..0..2..4
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CROSSREFS
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Column 1 is A006131(n-2)
Sequence in context: A271856 A164802 A201888 * A198879 A161321 A090656
Adjacent sequences: A185822 A185823 A185824 * A185826 A185827 A185828
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KEYWORD
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nonn,tabl
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AUTHOR
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R. H. Hardin Feb 05 2011
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STATUS
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approved
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