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A203050 Number of nX1 0..5 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor 1
1, 6, 36, 161, 636, 2507, 10213, 42182, 173606, 710976, 2908797, 11911516, 48807427, 199987737, 819315100, 3356387171, 13749952752, 56330082115, 230771042950, 945410224602, 3873094298871, 15867039092263, 65003096433432 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 1 of A203057

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -15*a(n-2) +35*a(n-3) -35*a(n-4) +56*a(n-5) -28*a(n-6) +36*a(n-7) -9*a(n-8) +10*a(n-9) -a(n-10) +a(n-11)

EXAMPLE

Some solutions for n=5

..3....4....4....3....3....1....3....5....5....4....0....2....4....2....5....2

..3....4....4....3....3....1....3....5....5....4....3....2....4....2....5....2

..5....5....1....2....4....5....0....5....3....5....3....5....5....5....3....1

..5....5....0....4....4....5....5....2....2....5....1....5....5....5....4....1

..0....2....0....4....3....4....5....0....1....4....0....2....5....1....4....0

CROSSREFS

Sequence in context: A225380 A225012 A228458 * A203332 A190065 A293068

Adjacent sequences:  A203047 A203048 A203049 * A203051 A203052 A203053

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 28 2011

STATUS

approved

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Last modified November 15 11:18 EST 2019. Contains 329144 sequences. (Running on oeis4.)