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A300776
T(n,k)=Number of nXk 0..1 arrays with every element equal to 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
7
0, 0, 0, 0, 1, 0, 0, 2, 2, 0, 0, 4, 3, 4, 0, 0, 9, 11, 11, 9, 0, 0, 19, 32, 36, 32, 19, 0, 0, 41, 102, 179, 179, 102, 41, 0, 0, 88, 330, 735, 1536, 735, 330, 88, 0, 0, 189, 1059, 3482, 10374, 10374, 3482, 1059, 189, 0, 0, 406, 3418, 15986, 78932, 116954, 78932, 15986, 3418
OFFSET
1,8
COMMENTS
Table starts
.0...0....0.....0.......0.........0...........0............0..............0
.0...1....2.....4.......9........19..........41...........88............189
.0...2....3....11......32.......102.........330.........1059...........3418
.0...4...11....36.....179.......735........3482........15986..........74347
.0...9...32...179....1536.....10374.......78932.......592064........4449947
.0..19..102...735...10374....116954.....1413931.....17336190......210669938
.0..41..330..3482...78932...1413931....27354464....538564737....10457318118
.0..88.1059.15986..592064..17336190...538564737..16992197390...534677180915
.0.189.3418.74347.4449947.210669938.10457318118.534677180915.27071152148341
LINKS
FORMULA
Empirical for column k:
k=1: a(n) = a(n-1)
k=2: a(n) = a(n-1) +2*a(n-2) +a(n-3)
k=3: [order 15]
k=4: [order 56] for n>57
EXAMPLE
Some solutions for n=5 k=4
..0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..0..0. .0..0..1..1
..0..0..1..1. .0..1..1..1. .0..1..1..1. .0..1..1..0. .0..1..1..1
..0..0..1..0. .1..0..0..1. .0..1..1..1. .0..1..0..1. .0..0..0..0
..1..1..0..0. .1..0..0..1. .0..0..0..1. .0..0..1..1. .0..0..0..0
..1..0..0..0. .1..1..1..1. .0..0..1..1. .0..1..1..1. .0..0..0..0
CROSSREFS
Column 2 is A078039(n-2).
Sequence in context: A179011 A300465 A300646 * A301400 A134315 A268584
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Mar 12 2018
STATUS
approved