login
A183249
Half the number of n X 3 binary arrays with the number of 1-1 adjacencies equal to the number of 0-0 adjacencies.
1
1, 6, 25, 164, 1092, 7954, 57519, 429936, 3205504, 24288784, 184062519, 1407419548, 10773952376, 82925706270, 639182387805, 4944237734904, 38299501221912, 297409232997320, 2312508964364352, 18013343447396448, 140477702503827052
OFFSET
1,2
COMMENTS
Column 3 of A183253.
LINKS
EXAMPLE
Some solutions with a(1,1)=0 for 3 X 3
..0..1..1....0..1..1....0..0..0....0..1..0....0..1..0....0..0..1....0..1..0
..0..1..0....0..0..1....1..1..1....0..1..0....0..1..1....0..0..1....1..1..0
..0..1..0....1..0..1....0..0..1....0..1..1....0..0..1....1..1..1....1..0..0
CROSSREFS
Cf. A183253.
Sequence in context: A042529 A323132 A357032 * A199008 A356909 A090566
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2011
STATUS
approved