|
|
A300337
|
|
Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
|
|
1
|
|
|
1, 13, 47, 255, 1272, 6780, 36498, 198531, 1088200, 5984027, 32988462, 182088665, 1005876277, 5559093240, 30731030239, 169909426328, 939499539384, 5195152803248, 28728519606270, 158867780965085, 878542696196419
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 6*a(n-1) +6*a(n-2) -40*a(n-3) -59*a(n-4) +79*a(n-5) +97*a(n-6) -40*a(n-7) +20*a(n-8) +8*a(n-9) -44*a(n-10) -6*a(n-11) for n>13
|
|
EXAMPLE
|
Some solutions for n=5
..0..0..0. .0..0..1. .0..0..0. .0..0..0. .0..1..0. .0..1..1. .0..0..0
..1..0..1. .0..1..1. .1..0..0. .0..1..0. .1..1..1. .1..1..1. .0..0..1
..1..1..1. .1..1..1. .1..1..0. .0..0..0. .1..0..0. .0..1..1. .0..0..0
..1..1..0. .0..1..1. .0..0..0. .1..1..1. .1..1..0. .0..0..1. .1..1..0
..1..0..0. .1..1..0. .1..0..1. .1..1..0. .1..0..0. .0..0..0. .1..0..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|