A183250 Half the number of nX4 binary arrays with the number of 1-1 adjacencies equal to the number of 0-0 adjacencies

2, 18, 164, 2101, 29100, 417190, 6104168, 90554742, 1356933444, 20489622108, 311268434796, 4751843588209, 72836045462648, 1120231330154058, 17279391496374040, 267199601139845596, 4140858845912841972

Offset

1,1

Comments

Column 4 of A183253

Links

R. H. Hardin, Table of n, a(n) for n = 1..100

Example

Some solutions with a(1,1)=0 for 3X4
..0..1..1..0....0..1..1..0....0..0..1..0....0..0..0..0....0..0..1..0
..0..1..1..0....0..0..0..1....1..1..1..0....1..1..0..0....1..1..0..0
..0..1..0..0....1..1..1..0....0..0..1..0....1..1..1..1....1..0..1..1

Crossrefs

Sequence in context: A037721 A245998 A005260 * A037728 A037623 A052865

Adjacent sequences: A183247 A183248 A183249 * A183251 A183252 A183253

Keyword

nonn

Author

R. H. Hardin Jan 03 2011

Status

approved