

A196653


T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,4,0,2,1 for x=0,1,2,3,4


7



1, 1, 1, 2, 7, 2, 3, 10, 10, 3, 5, 23, 27, 23, 5, 8, 57, 76, 76, 57, 8, 13, 122, 248, 391, 248, 122, 13, 21, 275, 735, 1895, 1895, 735, 275, 21, 34, 623, 2178, 8118, 15289, 8118, 2178, 623, 34, 55, 1394, 6622, 37661, 97292, 97292, 37661, 6622, 1394, 55, 89, 3133, 20006
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OFFSET

1,4


COMMENTS

Every 0 is next to 0 3's, every 1 is next to 1 4's, every 2 is next to 2 0's, every 3 is next to 3 2's, every 4 is next to 4 1's
Table starts
..1....1.....2.......3.........5...........8...........13.............21
..1....7....10......23........57.........122..........275............623
..2...10....27......76.......248.........735.........2178...........6622
..3...23....76.....391......1895........8118........37661.........172339
..5...57...248....1895.....15289.......97292.......689313........4940279
..8..122...735....8118.....97292......965315.....10183698......109227468
.13..275..2178...37661....689313....10183698....163282859.....2644969245
.21..623..6622..172339...4940279...109227468...2644969245....65251102177
.34.1394.20006..791490..34729760..1156876986..42258577643..1581794578196
.55.3133.60256.3631677.244473481.12249728518.676570815905.38383334376131


LINKS



EXAMPLE

Some solutions for n=6 k=4
..0..2..0..0....0..0..0..0....2..0..0..0....2..0..2..0....2..0..0..2
..0..2..2..2....0..0..2..2....0..1..2..0....0..0..2..2....0..0..0..0
..0..0..0..0....0..0..1..0....1..4..1..2....0..0..0..0....0..0..2..2
..0..1..0..0....0..1..4..1....0..1..0..0....2..0..0..0....0..2..2..0
..1..4..1..0....0..0..1..0....0..2..2..2....2..0..2..2....2..2..0..0
..0..1..0..0....0..0..0..2....2..0..0..0....0..0..2..0....0..0..0..2


CROSSREFS



KEYWORD



AUTHOR



STATUS

approved



