|
|
A232952
|
|
Number of nX5 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, and top left element zero
|
|
1
|
|
|
81, 4629, 283131, 17429409, 1074244299, 66226131273, 4082986991091, 251727862281441, 15519780149309307, 956841601733733945, 58992197961597648195, 3637048689898637056977, 224235130894279830031179
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 78*a(n-1) -1043*a(n-2) +2012*a(n-3) +10236*a(n-4) -39726*a(n-5) +41724*a(n-6) -6408*a(n-7) -8680*a(n-8) +2592*a(n-9) -96*a(n-10)
|
|
EXAMPLE
|
Some solutions for n=2
..0..0..2..2..0....0..1..3..1..3....0..2..0..2..0....0..0..0..0..2
..1..0..2..2..0....0..1..3..3..1....0..1..3..2..2....2..0..1..0..2
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|