A251807 Number of (7+1)X(n+1) 0..3 arrays with no 2X2 subblock having x11-x00 less than x10-x01

305991368, 310512400748, 114701510008550, 20552060379396424, 2134102396738819286, 144607697103715449366, 6950854990205965398511, 251944939127223553670932, 7212104449092454367810317

Offset

1,1

Comments

Row 7 of A251801

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

Example

Some solutions for n=1
..0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0
..0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0
..0..0....0..0....0..0....0..0....0..0....0..0....0..2....0..2....0..0....0..2
..2..2....0..2....0..2....0..0....2..2....0..2....0..0....0..0....2..2....2..2
..2..2....0..2....0..2....1..3....1..3....2..3....0..1....3..3....1..1....2..3
..2..2....0..3....1..3....0..3....0..3....0..2....0..0....0..0....0..2....1..1
..3..3....1..2....1..1....1..2....0..2....2..0....0..1....0..3....3..1....0..2
..0..3....0..0....1..2....2..2....3..1....0..2....2..1....0..0....1..3....3..1

Crossrefs

Sequence in context: A022219 A285433 A104965 * A184671 A034610 A015410

Adjacent sequences: A251804 A251805 A251806 * A251808 A251809 A251810

Keyword

nonn

Author

R. H. Hardin, Dec 09 2014

Status

approved