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A253352
Number of (3+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
125, 735, 4800, 31156, 200740, 1294016, 8338384, 53745952, 346434848, 2233207264, 14396108256, 92804450272, 598267360480, 3856769267168, 24862957621984, 160281121228768, 1033266051966176, 6661040300308960, 42940986249529056
OFFSET
1,1
COMMENTS
Row 3 of A253350
LINKS
FORMULA
Empirical: a(n) = 9*a(n-1) -8*a(n-2) -72*a(n-3) +96*a(n-4) +128*a(n-5) -128*a(n-6) -64*a(n-7) for n>10
EXAMPLE
Some solutions for n=4
..0..1..1..1..1....1..1..1..1..0....1..1..1..0..0....1..1..1..1..0
..1..1..0..0..1....0..0..0..1..1....1..1..1..0..0....0..0..0..1..1
..0..1..0..0..1....1..1..1..1..1....1..1..1..1..1....1..1..1..1..0
..0..1..1..1..1....1..0..1..1..0....1..1..1..1..0....1..1..1..1..1
CROSSREFS
Sequence in context: A060093 A253345 A016815 * A204611 A296037 A355885
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 30 2014
STATUS
approved