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A253520 Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically 1
9623, 42476, 84684, 162815, 370028, 930046, 2475610, 6886675, 19760474, 57829329, 171202242, 510066284, 1524744975, 4565782480, 13684014725, 41030420257, 123054948304, 369101554371, 1107190410316, 3321358741610, 9963671753637 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A253524
LINKS
FORMULA
Empirical: a(n) = 11*a(n-1) -51*a(n-2) +131*a(n-3) -205*a(n-4) +201*a(n-5) -121*a(n-6) +41*a(n-7) -6*a(n-8) for n>16
EXAMPLE
Some solutions for n=4
..1..1..0..0..2....0..1..1..1..2....1..2..2..0..2....1..1..0..1..1
..2..1..0..0..1....0..0..0..0..0....2..2..2..0..1....2..1..0..0..0
..2..1..0..0..0....2..2..2..2..2....2..2..2..0..0....2..1..0..0..0
..2..0..0..0..0....2..1..1..1..1....2..2..2..0..0....2..0..0..0..0
..1..0..2..2..2....2..1..2..2..2....1..1..1..0..2....1..0..1..2..2
CROSSREFS
Sequence in context: A236715 A233913 A031653 * A254418 A254425 A237231
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2015
STATUS
approved

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Last modified February 24 17:27 EST 2024. Contains 370307 sequences. (Running on oeis4.)