login
A222722
T(n,k)=Number of nXk 0..3 arrays with exactly floor(nXk/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order
5
1, 0, 0, 0, 6, 0, 6, 30, 30, 6, 20, 666, 1683, 666, 20, 20, 6524, 88552, 88552, 6524, 20, 70, 103378, 2807505, 12956013, 2807505, 103378, 70, 685, 1250904, 173596622, 1928517786, 1928517786, 173596622, 1250904, 685, 2808, 17976376, 5700425842
OFFSET
1,5
COMMENTS
Table starts
....1.........0............0..............6..............20..............20
....0.........6...........30............666............6524..........103378
....0........30.........1683..........88552.........2807505.......173596622
....6.......666........88552.......12956013......1928517786....289452236157
...20......6524......2807505.....1928517786....662075303107.474459483232672
...20....103378....173596622...289452236157.474459483232672
...70...1250904...5700425842.43727219083464
..685..17976376.361481561727
.2808.235892592
.5370
LINKS
EXAMPLE
Some solutions for n=3 k=4
..0..1..2..2....0..0..1..0....0..1..2..1....0..1..2..0....0..1..2..2
..3..1..3..1....2..0..2..3....2..0..3..3....3..1..1..2....2..3..1..1
..2..0..1..0....1..2..2..1....0..1..1..0....1..0..3..3....3..0..2..3
CROSSREFS
Column 1 is A222604
Sequence in context: A222918 A280480 A223104 * A222747 A222608 A353091
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Mar 03 2013
STATUS
approved