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A241104 Number of nX4 0..2 arrays with no element equal to one or three horizontal or vertical neighbors, with new values 0..2 introduced in row major order 1
4, 36, 294, 2436, 19814, 162776, 1333934, 10937316, 89651534, 734979136, 6025149574, 49393306556, 404916355574, 3319433387656, 27212098788254, 223079838087956, 1828767624421854, 14991902921730896, 122900877847563254 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A241108

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +21*a(n-2) -12*a(n-3) +8*a(n-4) -688*a(n-5) -1648*a(n-6) -768*a(n-7) -2304*a(n-8) +8192*a(n-9) +16384*a(n-10)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A059416 A240889 A108019 * A222428 A279581 A093186

Adjacent sequences:  A241101 A241102 A241103 * A241105 A241106 A241107

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 16 2014

STATUS

approved

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Last modified November 28 03:21 EST 2021. Contains 349400 sequences. (Running on oeis4.)