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A239172 Number of (n+1)X(2+1) 0..2 arrays with no element greater than all horizontal neighbors or equal to all vertical neighbors 1
26, 82, 676, 4338, 29380, 196698, 1321986, 8867938, 59528520, 399598612, 2681935810, 18001714474, 120831198520, 811019710990, 5443667518288, 36538530014326, 245249725777154, 1646142454877826, 11049078946194810 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A239178

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-2) +149*a(n-3) +319*a(n-4) +372*a(n-5) -742*a(n-6) -1302*a(n-7) +296*a(n-8) +279*a(n-9) +1010*a(n-10) -921*a(n-11) +278*a(n-12) +747*a(n-13) -508*a(n-14) +361*a(n-15) -662*a(n-16) +626*a(n-17) -360*a(n-18) +80*a(n-19)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A052241 A042332 A260199 * A291631 A325819 A138081

Adjacent sequences:  A239169 A239170 A239171 * A239173 A239174 A239175

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 11 2014

STATUS

approved

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Last modified May 9 19:47 EDT 2021. Contains 343746 sequences. (Running on oeis4.)