|
|
A198702
|
|
Number of nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor
|
|
1
|
|
|
1, 3, 14, 76, 488, 3508, 27422, 227045, 1950662, 17146596, 152812056, 1373072354, 12397256874, 112250461201, 1018054465392, 9242194131044, 83950882529364, 762814946316712, 6932614771099750, 63012101072493525, 572768961745981914
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 17*a(n-1) -80*a(n-2) +37*a(n-3) +349*a(n-4) -60*a(n-5) -729*a(n-6) -553*a(n-7) +572*a(n-8) +783*a(n-9) +139*a(n-10) -304*a(n-11) -170*a(n-12)
|
|
EXAMPLE
|
All solutions with all values 0 to 4 for n=5
..0..1....0..0....0..0....0..1....0..1....0..0....0..0....0..0
..0..1....1..2....1..1....0..1....0..1....1..1....1..2....1..1
..2..2....1..2....2..2....2..2....2..3....2..3....1..2....2..2
..3..3....3..3....3..3....3..4....2..3....2..3....3..4....3..4
..4..4....4..4....4..4....3..4....4..4....4..4....3..4....3..4
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|