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A253164 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock sum differing from its neighbors horizontally, vertically and nw-se diagonally 5
81, 558, 558, 3844, 5136, 3844, 26784, 46752, 46752, 26784, 186624, 443362, 555842, 443362, 186624, 1296000, 4189216, 7252320, 7252320, 4189216, 1296000, 9000000, 39478862, 92998506, 135741428, 92998506, 39478862, 9000000, 62568000 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Table starts
.........81.........558.........3844........26784........186624.......1296000
........558........5136........46752.......443362.......4189216......39478862
.......3844.......46752.......555842......7252320......92998506....1190692584
......26784......443362......7252320....135741428....2461955138...44789509812
.....186624.....4189216.....92998506...2461955138...62954425188.1612778665632
....1296000....39478862...1190692584..44789509812.1612778665632
....9000000...371551030..15179218714.808045500430
...62568000..3500351616.194198939906
..434972736.32968666098
.3022785216
LINKS
FORMULA
Empirical for column k:
k=1: a(n) = 3*a(n-1) +96*a(n-3) +504*a(n-4) +792*a(n-5) +2304*a(n-6) -13824*a(n-8) -13824*a(n-9)
EXAMPLE
Some solutions for n=2 k=4
..0..2..1..2..2....0..0..0..1..1....0..0..1..1..2....0..0..1..0..0
..0..2..2..0..0....0..1..2..2..0....1..2..1..2..1....0..2..1..1..1
..1..0..1..1..0....2..0..2..0..0....1..0..2..1..0....1..2..2..2..1
CROSSREFS
Column 1 is A185771
Sequence in context: A186536 A186528 A253294 * A185777 A253482 A186141
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 28 2014
STATUS
approved

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Last modified April 14 23:31 EDT 2024. Contains 371667 sequences. (Running on oeis4.)