|
|
A185464
|
|
Number of (n+1)X7 binary arrays with no 2X2 subblock determinant equal to any horizontal or vertical neighbor 2X2 subblock determinant
|
|
1
|
|
|
1320, 4452, 27102, 231636, 1388736, 11083678, 63886624, 505270226, 2903085730, 22962813645, 131933531918, 1043538136278, 5995683878222, 47423208533485, 272471604500138, 2155131419283957, 12382379727663458, 97939214947579914
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n)=38*a(n-2)+285*a(n-4)+2258*a(n-6)+6967*a(n-8)+24960*a(n-10)-27398*a(n-12)+34950*a(n-14)+8534*a(n-16)+1567*a(n-18)-849*a(n-20)-665*a(n-22)-470*a(n-24)+862*a(n-26)+264*a(n-28)+24*a(n-30) for n>36
|
|
EXAMPLE
|
Some solutions for 3X7
..1..1..0..1..0..1..0....0..1..0..1..1..1..0....1..1..0..1..0..1..1
..1..0..1..1..1..0..1....0..1..1..0..1..0..1....1..1..1..1..1..0..1
..0..1..1..1..0..1..0....1..1..1..1..0..1..1....0..1..0..1..0..1..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|