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A235674 Number of (n+1)X(3+1) 0..1 arrays with the difference between each 2X2 subblock maximum and minimum lexicographically nondecreasing columnwise and nonincreasing rowwise 1
208, 2456, 28584, 330840, 3824528, 44196144, 510685176, 5900818062, 68181837738, 787815537064, 9102909355490, 105180650740834, 1215322331681740, 14042586259073748, 162256730906114932, 1874814669334245592 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A235679

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 13*a(n-1) -7*a(n-2) -120*a(n-3) +60*a(n-4) +376*a(n-5) -111*a(n-6) -477*a(n-7) +47*a(n-8) +216*a(n-9) +20*a(n-10) -16*a(n-11)

EXAMPLE

Some solutions for n=3

..1..0..1..0....0..1..1..1....1..1..0..1....0..0..1..1....0..1..0..1

..1..0..0..0....0..1..0..1....0..0..1..0....1..0..0..0....1..1..1..0

..0..1..0..1....0..0..1..1....0..1..1..1....1..0..1..1....0..1..0..1

..0..1..1..1....0..0..0..1....1..0..1..0....1..1..0..1....1..0..0..0

CROSSREFS

Sequence in context: A230934 A236272 A184681 * A235444 A255074 A172967

Adjacent sequences:  A235671 A235672 A235673 * A235675 A235676 A235677

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 13 2014

STATUS

approved

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Last modified June 13 09:02 EDT 2021. Contains 344981 sequences. (Running on oeis4.)