login
A253332
Number of (7+1)X(n+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 30 2014
STATUS
approved