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A197090 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 4,3,2,0,1 for x=0,1,2,3,4 7
1, 1, 1, 1, 2, 1, 1, 5, 5, 1, 1, 10, 25, 10, 1, 1, 26, 96, 96, 26, 1, 1, 65, 422, 631, 422, 65, 1, 1, 161, 1780, 5101, 5101, 1780, 161, 1, 1, 403, 7537, 37952, 71867, 37952, 7537, 403, 1, 1, 1006, 31911, 289564, 939690, 939690, 289564, 31911, 1006, 1, 1, 2511, 135283 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,5
COMMENTS
Every 0 is next to 0 4's, every 1 is next to 1 3's, every 2 is next to 2 2's, every 3 is next to 3 0's, every 4 is next to 4 1's
Table starts
.1....1......1.........1...........1.............1................1
.1....2......5........10..........26............65..............161
.1....5.....25........96.........422..........1780.............7537
.1...10.....96.......631........5101.........37952...........289564
.1...26....422......5101.......71867........939690.........12635748
.1...65...1780.....37952......939690......21996614........522569033
.1..161...7537....289564....12635748.....522569033......21989908007
.1..403..31911...2200339...168802858...12390326286.....923559415946
.1.1006.135283..16713718..2257145231..293837693200...38737498552503
.1.2511.573054.127074214.30181119596.6966924806564.1625808615727565
LINKS
EXAMPLE
Some solutions for n=6 k=4
..0..0..3..0....0..3..0..0....0..0..2..2....0..3..0..0....0..0..3..0
..0..3..0..0....0..0..0..3....0..0..2..2....0..0..0..3....0..0..0..0
..2..2..0..3....2..2..3..0....0..0..0..0....3..0..0..0....0..0..0..0
..2..2..0..0....2..2..0..0....0..0..0..0....0..0..3..0....2..2..0..0
..0..3..0..3....0..3..0..0....3..0..3..1....0..2..2..0....2..2..3..0
..0..0..0..0....0..0..3..0....0..0..0..0....0..2..2..0....0..0..0..0
CROSSREFS
Column 2 is A196630
Sequence in context: A128564 A196636 A196641 * A008518 A264862 A176420
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Oct 10 2011
STATUS
approved

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Last modified February 25 19:44 EST 2024. Contains 370332 sequences. (Running on oeis4.)