|
|
A186591
|
|
Number of (n+3)X4 0..3 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock
|
|
1
|
|
|
4294967296, 48243, 430183, 3306753, 21993587, 53301263, 71095231, 78728809, 86748644, 89692007, 94541176, 120087461, 205742497, 372822912, 600755929, 913680450, 1430990335, 2201398558, 3168904216, 4468022885, 6637262756
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n)=2*a(n-1)-a(n-2)+3*a(n-4)-6*a(n-5)+3*a(n-6)+3*a(n-8)-3*a(n-9) for n>30
|
|
EXAMPLE
|
Some solutions for 5X4
..3..3..2..1....0..1..2..2....2..1..1..2....0..3..2..0....1..1..2..0
..0..3..3..1....0..0..1..0....0..2..3..3....0..3..2..0....1..1..2..0
..0..0..3..2....0..0..0..3....0..0..0..0....0..3..2..0....1..1..2..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..3..2..0....1..1..2..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..1..2..2....3..0..1..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|