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A230933 Number of black-square subarrays of (n+2)X(6+2) 0..3 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero 2
42, 438, 3768, 37984, 396950, 4092246, 41991510, 431437274, 4435310118, 45590703272, 468598417126, 4816515719528, 49507271980530, 508867096276696, 5230454214732138, 53761897206996568, 552598679075230458 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A230935

LINKS

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

R. H. Hardin, Empirical recurrence of order 71

FORMULA

Empirical recurrence of order 71 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

..1..x..3..x..1..x..2..x....1..x..3..x..1..x..3..x....1..x..1..x..1..x..3..x

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

..3..x..3..x..3..x..3..x....1..x..1..x..3..x..3..x....3..x..3..x..3..x..3..x

CROSSREFS

Sequence in context: A251425 A242144 A242145 * A231110 A156762 A248094

Adjacent sequences:  A230930 A230931 A230932 * A230934 A230935 A230936

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 01 2013

STATUS

approved

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Last modified August 2 01:19 EDT 2021. Contains 346408 sequences. (Running on oeis4.)