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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.)