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A232197 Number of (n+1)X(1+1) 0..2 arrays with every element both >= and <= some horizontal, vertical or antidiagonal neighbor 1
15, 109, 685, 4483, 29469, 193531, 1270657, 8343063, 54780825, 359691769, 2361740413, 15507217849, 101820594071, 668555339287, 4389743011111, 28823109441929, 189252909756115, 1242637055605621, 8159170994793111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A232204

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) -5*a(n-2) +16*a(n-3) -12*a(n-4) -a(n-5) -7*a(n-6) -9*a(n-7) +2*a(n-8) -2*a(n-9) +3*a(n-10) +2*a(n-11) -a(n-12)

EXAMPLE

Some solutions for n=6

..1..0....1..0....0..0....0..0....0..0....0..0....0..2....1..1....0..2....1..0

..2..0....1..0....0..2....0..0....2..0....2..2....0..2....0..0....0..2....1..0

..2..1....1..1....2..2....0..0....2..1....1..2....0..0....0..1....0..1....0..1

..2..0....1..0....1..1....0..2....2..2....1..1....2..2....1..1....1..0....2..2

..2..0....0..0....0..0....2..2....2..0....0..0....1..0....1..1....0..1....2..2

..0..1....0..2....0..1....2..1....0..2....0..0....0..2....1..2....0..1....1..0

..1..1....2..2....0..1....0..0....1..2....0..0....1..2....1..2....0..0....1..0

CROSSREFS

Sequence in context: A232124 A232204 A232117 * A347500 A205352 A055504

Adjacent sequences:  A232194 A232195 A232196 * A232198 A232199 A232200

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 20 2013

STATUS

approved

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Last modified June 25 07:37 EDT 2022. Contains 354835 sequences. (Running on oeis4.)