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A253365 Number of (n+2)X(6+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally and vertically 1
3472, 5664, 27072, 53128, 175328, 520888, 1255456, 4289736, 9455136, 31254904, 73764448, 218493128, 577738400, 1574888312, 4449330272, 12022817096, 33692526368, 94722902008, 253587884000, 742190201160, 1916549546400 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 6 of A253367
LINKS
FORMULA
Empirical: a(n) = 16*a(n-2) -110*a(n-4) +432*a(n-6) -809*a(n-8) +2032*a(n-10) -4696*a(n-12) +4432*a(n-14) -2272*a(n-16) -1952*a(n-18) -224*a(n-20) +320*a(n-22) for n>26
EXAMPLE
Some solutions for n=4
..0..1..0..1..0..1..0..1....0..1..0..1..0..1..0..1....1..1..1..1..1..0..1..1
..0..0..0..0..0..0..0..0....1..1..1..1..1..1..1..1....0..1..0..1..1..1..0..1
..0..1..0..1..0..1..0..1....0..1..0..1..0..1..0..1....1..0..1..0..1..0..1..1
..1..0..0..0..0..0..0..0....1..1..1..1..1..1..1..1....0..1..1..1..1..1..0..1
..1..1..0..1..0..1..0..1....0..1..0..1..0..1..0..1....1..0..1..0..1..1..1..1
..1..1..1..0..0..0..0..0....1..1..1..0..1..0..0..0....0..1..1..1..0..1..0..1
CROSSREFS
Sequence in context: A108250 A237548 A237546 * A109484 A232889 A328817
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 30 2014
STATUS
approved

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Last modified February 23 09:42 EST 2024. Contains 370276 sequences. (Running on oeis4.)