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A203185 Number of nX2 0..4 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor 1
5, 165, 3209, 53233, 904175, 15703631, 271942421, 4694586685, 81072693659, 1400687275175, 24198485401075, 418031304578759, 7221573611135109, 124755169399163453, 2155187028114381493, 37231528687477204117 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A203191

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-1) -15*a(n-2) +821*a(n-3) +1430*a(n-4) +9500*a(n-5) +11557*a(n-6) +27197*a(n-7) +15316*a(n-8) +14400*a(n-9)

EXAMPLE

Some solutions for n=4

..0..3....4..3....3..3....3..2....2..1....0..4....4..1....1..3....0..3....4..3

..4..3....4..0....2..0....3..1....2..2....0..4....4..3....1..4....3..3....4..0

..4..2....0..4....0..0....2..2....0..0....3..4....4..2....1..4....4..4....1..2

..2..0....0..4....2..2....4..4....0..0....3..0....4..4....2..2....0..0....4..4

CROSSREFS

Sequence in context: A316646 A316174 A317456 * A129995 A259613 A047940

Adjacent sequences:  A203182 A203183 A203184 * A203186 A203187 A203188

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 30 2011

STATUS

approved

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Last modified September 19 15:31 EDT 2019. Contains 327199 sequences. (Running on oeis4.)