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A185825 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 8
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 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

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

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..60

EXAMPLE

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

CROSSREFS

Column 1 is A006131(n-2)

Sequence in context: A271856 A164802 A201888 * A198879 A161321 A090656

Adjacent sequences:  A185822 A185823 A185824 * A185826 A185827 A185828

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Feb 05 2011

STATUS

approved

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Last modified April 20 06:36 EDT 2019. Contains 322294 sequences. (Running on oeis4.)