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A235675 Number of (n+1)X(4+1) 0..1 arrays with the difference between each 2X2 subblock maximum and minimum lexicographically nondecreasing columnwise and nonincreasing rowwise 1
742, 15790, 330840, 6894210, 143484144, 2985166430, 62100488254, 1291848133836, 26873571586520, 559034577488572, 11629252189546650, 241916151493365248, 5032432178704803216, 104686575579504167834, 2177730111458692702436 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A235679

LINKS

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

FORMULA

Empirical: a(n) = 25*a(n-1) -56*a(n-2) -760*a(n-3) +1870*a(n-4) +9093*a(n-5) -19671*a(n-6) -53908*a(n-7) +96797*a(n-8) +165297*a(n-9) -249510*a(n-10) -263103*a(n-11) +342224*a(n-12) +215121*a(n-13) -241863*a(n-14) -95529*a(n-15) +88208*a(n-16) +23290*a(n-17) -16128*a(n-18) -2854*a(n-19) +1362*a(n-20) +136*a(n-21) -40*a(n-22)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A044984 A252576 A188483 * A235445 A119595 A289141

Adjacent sequences:  A235672 A235673 A235674 * A235676 A235677 A235678

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 13 2014

STATUS

approved

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Last modified June 18 16:38 EDT 2021. Contains 345120 sequences. (Running on oeis4.)