A253962 Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal median minus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally

2992, 20868, 142800, 1022752, 7533252, 55225242, 405335284, 2967835536, 21767762337, 159539717188, 1170238640448, 8580148657067, 62929783066961, 461452519240322, 3384210675873873, 24816818876304404, 181995327827050849

Offset

1,1

Comments

Row 2 of A253961

Links

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

Example

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

Crossrefs

Sequence in context: A205241 A317398 A346221 * A253955 A253758 A230013

Adjacent sequences: A253959 A253960 A253961 * A253963 A253964 A253965

Keyword

nonn

Author

R. H. Hardin, Jan 20 2015

Status

approved