A251272 Number of (5+1)X(n+1) 0..1 arrays with no 2X2 subblock having x11-x00 less than x10-x01

1049, 8812, 49872, 217634, 790734, 2510004, 7189937, 19018266, 47251067, 111715980, 253943272, 559554564, 1203154060, 2538190856, 5276700889, 10848708252, 22120797741, 44832823100, 90470607368, 182010260670

Offset

1,1

Comments

Row 5 of A251268

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 13*a(n-1) -77*a(n-2) +275*a(n-3) -660*a(n-4) +1122*a(n-5) -1386*a(n-6) +1254*a(n-7) -825*a(n-8) +385*a(n-9) -121*a(n-10) +23*a(n-11) -2*a(n-12)

Example

Some solutions for n=3
..0..0..1..1....1..1..0..0....0..0..0..1....1..1..1..1....1..0..1..0
..0..0..0..1....0..0..1..1....0..0..1..1....0..0..1..1....0..1..0..1
..0..0..0..1....0..0..0..0....0..1..1..1....0..1..1..1....0..0..1..1
..1..1..1..1....0..0..0..0....1..0..0..0....0..1..1..1....0..0..0..1
..0..0..0..0....0..0..1..1....0..1..1..1....1..1..1..1....0..0..1..1
..0..0..1..1....0..0..0..1....0..1..1..1....0..0..1..1....0..1..1..1

Crossrefs

Sequence in context: A331346 A164771 A031600 * A030083 A184203 A015064

Adjacent sequences: A251269 A251270 A251271 * A251273 A251274 A251275

Keyword

nonn

Author

R. H. Hardin, Dec 01 2014

Status

approved