A227440 Number of n X 4 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 5 binary array having two adjacent 1's and two adjacent 0's.

16, 240, 3346, 46126, 636996, 8802600, 121623396, 1680297950, 23214121178, 320714593384, 4430829128772, 61214050174352, 845701665042092, 11683776706885344, 161417013884667940, 2230053943181472702

Offset

1,1

Comments

Column 4 of A227442.

Links

R. H. Hardin, Table of n, a(n) for n = 1..52

Example

Some solutions for n=4
..1..1..1..1....1..0..0..0....1..1..0..1....1..1..0..1....1..0..0..0
..1..0..0..0....1..0..0..0....0..1..0..1....0..1..0..0....1..0..0..0
..0..1..1..1....0..1..0..0....0..0..0..1....1..0..0..1....0..1..1..0
..1..1..0..0....0..0..1..1....1..1..0..1....1..1..1..1....0..1..0..0

Crossrefs

Sequence in context: A283411 A161591 A376641 * A103975 A162791 A060198

Adjacent sequences: A227437 A227438 A227439 * A227441 A227442 A227443

Keyword

nonn

Author

R. H. Hardin Jul 11 2013

Status

approved