A227332 Number of n X 5 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 6 binary array having two adjacent 1's and two adjacent 0's, with rows and columns of the latter in lexicographically nondecreasing order.

26, 285, 3013, 33297, 366606, 3774137, 35026386, 290742258, 2174611745, 14827903973, 93194118189, 544831575434, 2984722060733, 15415176834304, 75441255758231, 351377507165460, 1563422116701546, 6667161613820532

Offset

1,1

Comments

Column 5 of A227333.

Links

R. H. Hardin, Table of n, a(n) for n = 1..56

Example

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

Crossrefs

Sequence in context: A200555 A130901 A336732 * A020925 A224331 A125414

Adjacent sequences: A227329 A227330 A227331 * A227333 A227334 A227335

Keyword

nonn

Author

R. H. Hardin Jul 07 2013

Status

approved