|
| |
|
|
A317762
|
|
Number of nX6 0..1 arrays with every element unequal to 0, 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
|
|
1
|
|
|
|
32, 89, 100, 127, 177, 266, 425, 709, 1217, 2126, 3753, 6666, 11882, 21223, 37952, 67914, 121578, 217696, 389856, 698220, 1250549, 2239862, 4011891, 7185904, 12871122, 23054360, 41294363, 73965487, 132485357, 237305006, 425055936
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
Column 6 of A317764.
|
|
|
LINKS
|
R. H. Hardin, Table of n, a(n) for n = 1..210
|
|
|
FORMULA
|
Empirical: a(n) = 2*a(n-1) +a(n-2) -2*a(n-3) -a(n-4) +a(n-7) for n>10
|
|
|
EXAMPLE
|
Some solutions for n=5
..0..0..0..0..0..0. .0..1..1..0..0..0. .0..0..1..1..0..0. .0..0..0..0..0..0
..1..1..1..1..1..1. .0..1..1..0..0..0. .0..1..1..0..0..1. .0..0..0..0..0..1
..1..1..1..1..1..1. .0..1..1..0..0..0. .1..1..0..0..1..1. .0..0..0..0..1..1
..1..1..1..1..1..0. .0..1..1..0..0..0. .1..0..0..1..1..0. .0..0..0..1..1..0
..1..1..1..1..0..0. .0..1..1..0..0..1. .0..0..1..1..0..0. .0..0..1..1..0..0
|
|
|
CROSSREFS
|
Cf. A317764.
Sequence in context: A229721 A184029 A184021 * A318341 A318073 A279713
Adjacent sequences: A317759 A317760 A317761 * A317763 A317764 A317765
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
R. H. Hardin, Aug 06 2018
|
|
|
STATUS
|
approved
|
| |
|
|
