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A203060 Number of nX2 0..6 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor 1
7, 455, 16625, 491953, 14623955, 449303011, 13830934581, 423540231589, 12960863692877, 396932534594913, 12158312949466207, 372374419011765611, 11404358044432223467, 349276052222114506979, 10697191686358715474073 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A203066

LINKS

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

FORMULA

Empirical: a(n) = 28*a(n-1) -119*a(n-2) +5320*a(n-3) +14657*a(n-4) +262356*a(n-5) +711785*a(n-6) +4372840*a(n-7) +8450903*a(n-8) +26917092*a(n-9) +32103217*a(n-10) +55870264*a(n-11) +31144464*a(n-12) +25401600*a(n-13)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A158599 A009660 A024097 * A261479 A241363 A196540

Adjacent sequences:  A203057 A203058 A203059 * A203061 A203062 A203063

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 28 2011

STATUS

approved

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Last modified September 25 13:01 EDT 2020. Contains 337344 sequences. (Running on oeis4.)