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A235767 Number of (n+1)X(2+1) 0..1 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing columnwise and nonincreasing rowwise 1
46, 178, 628, 1948, 5643, 15185, 39029, 95779, 227803, 525427, 1185737, 2620063, 5700715, 12222279, 25917801, 54393195, 113263283, 234136955, 481329353, 984473879, 2005754987, 4072140479, 8245166361, 16654521715, 33579036115 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235772

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +6*a(n-2) -42*a(n-3) +5*a(n-4) +178*a(n-5) -130*a(n-6) -380*a(n-7) +440*a(n-8) +400*a(n-9) -688*a(n-10) -128*a(n-11) +528*a(n-12) -96*a(n-13) -160*a(n-14) +64*a(n-15)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A350556 A251467 A251460 * A192850 A211334 A160334

Adjacent sequences:  A235764 A235765 A235766 * A235768 A235769 A235770

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 15 2014

STATUS

approved

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Last modified January 20 00:08 EST 2022. Contains 350467 sequences. (Running on oeis4.)