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A208347 Number of nX2 0..3 arrays with new values 0..3 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors) 1
2, 15, 100, 868, 7780, 69988, 629860, 5668708, 51018340, 459165028, 4132485220, 37192366948, 334731302500, 3012581722468, 27113235502180, 244019119519588, 2196172075676260, 19765548681086308, 177889938129776740 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A208353

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) -9*a(n-2) for n>4

EXAMPLE

Some solutions for n=4

..0..0....0..1....0..0....0..0....0..0....0..0....0..1....0..0....0..0....0..0

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

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

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

CROSSREFS

Sequence in context: A288952 A258390 A027080 * A293045 A081018 A006675

Adjacent sequences:  A208344 A208345 A208346 * A208348 A208349 A208350

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 25 2012

STATUS

approved

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Last modified September 20 21:19 EDT 2019. Contains 327247 sequences. (Running on oeis4.)