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A253353
Number of (4+1)X(n+1) 0..1 arrays with every 2X2 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally
1
335, 3192, 30920, 305872, 3006936, 29746140, 294030700, 2909622092, 28790285676, 284932211532, 2819926224684, 27909384512908, 276225964612076, 2733896477818444, 27058289111384492, 267805400759163404
OFFSET
1,1
COMMENTS
Row 4 of A253350
LINKS
FORMULA
Empirical: a(n) = 18*a(n-1) -73*a(n-2) -256*a(n-3) +2060*a(n-4) -1216*a(n-5) -12612*a(n-6) +18224*a(n-7) +20992*a(n-8) -40064*a(n-9) -9984*a(n-10) +24576*a(n-11) for n>15
EXAMPLE
Some solutions for n=3
..1..1..0..0....1..1..1..0....1..1..1..1....0..1..1..1....0..1..1..1
..1..1..1..1....0..1..1..1....1..1..0..1....0..1..1..0....0..0..1..0
..1..1..1..0....1..1..0..1....1..1..1..1....0..1..1..0....1..1..1..1
..0..0..1..1....0..1..0..1....0..1..1..0....1..1..1..1....1..0..0..1
..0..0..1..1....0..1..0..1....1..1..1..0....0..0..0..0....1..0..0..1
CROSSREFS
Sequence in context: A038648 A224533 A253346 * A204612 A204796 A348822
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 30 2014
STATUS
approved