|
|
A230784
|
|
Number of nX4 0..3 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero
|
|
1
|
|
|
0, 820, 117372, 14875702, 1986882996, 265749521034, 35493529463278, 4740947736896364, 633274321865930072, 84589617891954381282, 11299056033900192621348, 1509271228479641269394190
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical recurrence of order 67 (see link above)
|
|
EXAMPLE
|
Some solutions for n=3
..0..0..3..2....0..1..2..3....0..1..3..2....0..2..1..0....0..1..3..0
..0..1..2..0....1..2..2..0....2..0..3..2....1..3..0..3....1..2..2..1
..3..3..0..1....3..0..0..1....3..2..1..2....1..2..2..1....0..1..0..3
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|