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A235511 Number of (n+1)X(2+1) 0..1 arrays with the sum of each 2X2 subblock maximum and minimum lexicographically nondecreasing rowwise and columnwise 1
58, 382, 2501, 16117, 103736, 666171, 4277473, 27457539, 176252122, 1131335938, 7261887435, 46612840826, 299200172520, 1920515773688, 12327470112339, 79127967273475, 507909185499894, 3260184071197905, 20926576064749259 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235517

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -2*a(n-2) -66*a(n-3) +70*a(n-4) +142*a(n-5) -152*a(n-6) -166*a(n-7) +114*a(n-8) +110*a(n-9) -22*a(n-10) -26*a(n-11) +a(n-12) +2*a(n-13)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A235673 A235730 A235443 * A255684 A156639 A249003

Adjacent sequences:  A235508 A235509 A235510 * A235512 A235513 A235514

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 11 2014

STATUS

approved

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Last modified September 28 22:34 EDT 2021. Contains 347717 sequences. (Running on oeis4.)