A254513 Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of four medians of central row, central column, diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally

2703, 12324, 55667, 238740, 1038340, 4546393, 19754506, 85550331, 370307568, 1600037880, 6905546384, 29753763842, 128038285985, 550179273386, 2361021857130, 10118806677168, 43313794030418, 185189314116533

Offset

1,1

Comments

Row 2 of A254512

Links

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

Example

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

Crossrefs

Sequence in context: A153513 A333130 A214016 * A254506 A254813 A358430

Adjacent sequences: A254510 A254511 A254512 * A254514 A254515 A254516

Keyword

nonn

Author

R. H. Hardin, Jan 31 2015

Status

approved