|
|
A203492
|
|
Number of 2Xn 0..2 arrays with row sums equal and column sums unequal to adjacent columns
|
|
1
|
|
|
3, 10, 80, 556, 3348, 20596, 134412, 888232, 5836068, 38457456, 255381636, 1704162724, 11399565860, 76433483528, 513785171540, 3461284463632, 23360156262164, 157908381404144, 1068981156413892, 7246198178206132
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=5
..0..2..0..2..2....1..0..1..2..0....2..1..0..2..1....1..1..1..2..1
..0..1..2..2..1....2..0..2..0..0....2..2..1..1..0....1..2..1..1..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|