A253332 Number of (7+1)X(n+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw

3249, 9228, 25659, 74953, 210417, 600020, 1660088, 4590122, 12462900, 33364770, 88332846, 228094422, 584261303, 1450543774, 3577232487, 8532736844, 20234227845, 46437782630, 106028484423, 234761319957, 517489800375

Offset

1,1

Comments

Row 7 of A253326

Links

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

R. H. Hardin, Empirical recurrence of order 87

Formula

Empirical recurrence of order 87 (see link above)

Example

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

Crossrefs

Sequence in context: A247725 A265198 A269061 * A253325 A204038 A235412

Adjacent sequences: A253329 A253330 A253331 * A253333 A253334 A253335

Keyword

nonn

Author

R. H. Hardin, Dec 30 2014

Status

approved