|
|
A298897
|
|
Number of nX3 0..1 arrays with every element equal to 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
|
|
1
|
|
|
0, 1, 1, 2, 3, 7, 12, 25, 47, 96, 187, 377, 746, 1497, 2981, 5970, 11919, 23851, 47668, 95357, 190659, 381352, 762615, 1525285, 3050426, 6100941, 12201649, 24403442, 48806507, 97613247, 195225884, 390452145, 780903303, 1561807216, 3123612835
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,4
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 2*a(n-1) +a(n-2) -2*a(n-3) +a(n-4) -2*a(n-5)
|
|
EXAMPLE
|
All solutions for n=5
..0..0..0. .0..0..0. .0..0..0
..0..0..0. .0..0..0. .0..0..0
..0..0..0. .1..1..1. .0..0..0
..0..0..0. .1..1..1. .1..1..1
..0..0..0. .1..1..1. .1..1..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|