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A183259
Number of nX4 binary arrays with the number of 0-1 adjacencies equal to the number of 0-0 adjacencies
1
3, 22, 157, 1899, 23285, 284314, 3534109, 44666147, 568723429, 7296845360, 94115102881, 1219598072719, 15862582371441, 206984139821242, 2708176662889977, 35518310665734877, 466794647103979156
OFFSET
1,1
COMMENTS
Column 4 of A183262
LINKS
EXAMPLE
Some solutions for 4X4
..0..0..1..1....0..1..0..0....0..0..0..0....0..0..0..0....1..0..0..0
..0..0..1..1....0..0..0..1....1..0..1..0....1..1..0..0....1..0..1..0
..0..0..1..1....1..1..0..0....0..0..0..1....0..1..0..0....0..0..1..1
..0..1..0..1....1..0..0..0....0..0..1..1....1..0..0..1....0..0..0..1
CROSSREFS
Sequence in context: A037782 A041661 A037586 * A218668 A164021 A192365
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2011
STATUS
approved