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A203059 Number of nX1 0..6 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor 1
1, 7, 49, 252, 1127, 4977, 22736, 105813, 491533, 2269938, 10462235, 48259083, 222798408, 1028746629, 4749274209, 21922813539, 101196577809, 467142348798, 2156444661242, 9954648966159, 45952741121083, 212127214776309 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 1 of A203066

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) -21*a(n-2) +56*a(n-3) -70*a(n-4) +126*a(n-5) -84*a(n-6) +120*a(n-7) -45*a(n-8) +55*a(n-9) -11*a(n-10) +12*a(n-11) -a(n-12) +a(n-13)

EXAMPLE

Some solutions for n=5

..0....5....6....2....4....4....2....0....2....1....6....4....1....4....6....4

..2....5....6....3....4....4....4....3....2....2....6....4....1....6....6....4

..6....0....0....3....4....5....4....4....4....2....0....1....3....6....0....1

..6....6....2....6....1....5....4....6....5....1....6....6....6....0....4....5

..5....6....2....6....1....4....1....6....5....1....6....6....6....0....4....5

CROSSREFS

Sequence in context: A188561 A225013 A228459 * A203383 A293887 A224131

Adjacent sequences:  A203056 A203057 A203058 * A203060 A203061 A203062

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 28 2011

STATUS

approved

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Last modified September 25 22:38 EDT 2020. Contains 337346 sequences. (Running on oeis4.)