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A183349
Number of nX7 binary arrays with each 1 adjacent to exactly one 0 vertically and one 0 horizontally
1
1, 109, 289, 943, 5121, 21613, 88177, 387783, 1670453, 7119039, 30633319, 131658725, 564682433, 2424870987, 10413508165, 44703599613, 191933847189, 824103385305, 3538210911515, 15191170400903, 65223636323455
OFFSET
1,2
COMMENTS
Column 7 of A183352
LINKS
FORMULA
Empirical: a(n)=3*a(n-2)+40*a(n-3)+89*a(n-4)+132*a(n-5)+a(n-6)-366*a(n-7)-706*a(n-8)-596*a(n-9)+129*a(n-10)+1289*a(n-11)+1758*a(n-12)+437*a(n-13)-1144*a(n-14)-1301*a(n-15)-300*a(n-16)+471*a(n-17)+437*a(n-18)+38*a(n-19)-52*a(n-20)+46*a(n-21)-84*a(n-22)-44*a(n-23)-116*a(n-24)+24*a(n-25)-24*a(n-26)-24*a(n-27)-64*a(n-28)-32*a(n-29)-16*a(n-30)
EXAMPLE
Some solutions for 5X7
..1..0..0..0..0..0..0....0..0..1..1..0..0..0....1..0..1..1..0..0..0
..0..0..0..0..0..0..1....0..0..0..0..0..0..1....0..0..0..0..0..0..0
..0..0..0..0..0..0..1....0..0..0..1..1..0..1....0..0..0..0..1..1..0
..0..0..0..0..0..0..0....0..0..0..1..1..0..0....0..0..0..0..1..1..0
..1..0..0..0..0..0..0....0..1..1..0..0..0..1....0..1..1..0..0..0..1
CROSSREFS
Sequence in context: A193395 A140036 A031419 * A238682 A070180 A107198
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2011
STATUS
approved