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A254300
Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the diagonal and antidiagonal minus the sum of the minimums of the central row and column nondecreasing horizontally and vertically
1
2812, 18098, 93326, 460326, 2313072, 11552577, 57873415, 290073742, 1451688456, 7262959692, 36306895375, 181350169411, 905256006521, 4516011284904, 22516704700238, 112215191429193, 559008725142913, 2783743320043295
OFFSET
1,1
COMMENTS
Column 2 of A254306
LINKS
FORMULA
Empirical: a(n) = 9*a(n-1) -11*a(n-2) -55*a(n-3) -60*a(n-4) +471*a(n-5) +730*a(n-6) -962*a(n-7) -3277*a(n-8) -3742*a(n-9) +2269*a(n-10) +16038*a(n-11) +21259*a(n-12) +1090*a(n-13) -38973*a(n-14) -62956*a(n-15) -29948*a(n-16) +40621*a(n-17) +93546*a(n-18) +80737*a(n-19) -2387*a(n-20) -76657*a(n-21) -81969*a(n-22) -30850*a(n-23) +26462*a(n-24) +42912*a(n-25) +23544*a(n-26) -2720*a(n-27) -12176*a(n-28) -4704*a(n-29) +864*a(n-30) +768*a(n-31) +128*a(n-32) for n>37
EXAMPLE
Some solutions for n=3
..0..0..0..1....1..0..0..0....0..1..0..0....1..1..1..0....1..1..0..0
..1..1..1..1....1..1..1..0....1..1..0..0....1..1..0..0....1..1..1..0
..1..0..0..0....1..0..1..0....1..1..1..0....1..1..1..0....1..0..1..1
..1..0..1..1....0..1..0..1....0..0..1..1....1..0..1..1....1..1..0..0
..1..1..1..0....0..1..0..1....0..0..0..0....1..0..0..0....0..1..1..1
CROSSREFS
Sequence in context: A254261 A258524 A258531 * A254916 A107533 A065668
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 27 2015
STATUS
approved