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A252904 T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every consecutive three elements in every row and column having exactly two distinct values, and new values 0 upwards introduced in row major order 6
384, 2793, 2793, 19320, 30453, 19320, 139968, 306680, 306680, 139968, 997740, 3255537, 4385530, 3255537, 997740, 7214139, 33858062, 66702186, 66702186, 33858062, 7214139, 51847038, 357165303, 990142582, 1470299799, 990142582 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

......384.......2793........19320.........139968.........997740........7214139

.....2793......30453.......306680........3255537.......33858062......357165303

....19320.....306680......4385530.......66702186......990142582....14924920644

...139968....3255537.....66702186.....1470299799....31496378270...686625400736

...997740...33858062....990142582....31496378270...973958225703.30642385604286

..7214139..357165303..14924920644...686625400736.30642385604286

.51847038.3740990254.223188511528.14835814827267

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..60

FORMULA

Empirical for column k:

k=1: [linear recurrence of order 18]

EXAMPLE

Some solutions for n=2 k=4

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

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

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

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

CROSSREFS

Sequence in context: A256735 A256728 A236029 * A252899 A183686 A134241

Adjacent sequences:  A252901 A252902 A252903 * A252905 A252906 A252907

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Dec 24 2014

STATUS

approved

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Last modified June 25 03:59 EDT 2022. Contains 354835 sequences. (Running on oeis4.)