|
|
A300765
|
|
Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
|
|
1
|
|
|
2, 15, 33, 91, 247, 728, 2042, 5974, 17545, 51551, 151557, 446408, 1314475, 3869787, 11400978, 33619541, 99210170, 292931867, 865301600, 2556823741, 7556496705, 22335732398, 66027826136, 195206654273, 577164023144, 1706621739932
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=5
..0..1..0..0. .0..0..1..0. .0..0..0..0. .0..0..1..1. .0..1..0..1
..0..1..0..1. .1..1..0..0. .1..1..1..0. .1..0..0..1. .0..1..0..1
..0..1..1..1. .0..0..0..0. .0..0..1..1. .1..1..0..0. .1..0..1..0
..0..0..1..1. .0..1..1..1. .1..0..0..0. .0..1..1..1. .0..1..0..0
..1..1..0..0. .1..0..0..1. .1..1..1..0. .0..0..0..0. .0..1..1..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|